You are given a paragraph, a question and some answer options (associated with "A", "B", "C", "D", etc.) You need to list all the correct answer options with their associated letters (e.g. "A" can be a valid answer). Note that sometimes, more than one option can answer the question correctly and completely. In those cases, please generate all such options separated by a comma (e.g. "A, B" is a valid answer). Do not generate anything else apart from one or more of the following characters: 'A', 'B, 'C', 'D', etc.

Example Input: Paragraph- Sent 1: Gravitational Potential Energy is affected by position.
Sent 2: Like the leaves on trees, anything that is raised up has the potential to fall.
Sent 3: It has potential energy.
Sent 4: You can see examples of people with gravitational potential energy in 1.5 Figure below.
Sent 5: Gravitational potential energy depends on two things.
Sent 6: It depends on its weight, because a large falling rock can do more damage than a leaf falling from a tree.
Sent 7: It also depends on its height above the ground.
Sent 8: Like the skateboarder, the higher the ramp, the faster he will be going when he reaches the bottom.
Sent 9: Like all energy, gravitational potential energy has the ability to do work.
Sent 10: In this case, weight has the potential to deliver a force.
Sent 11: More important for us is that it has the ability to cause change.
Sent 12: What kind of change you may ask?
Sent 13: Gravitational potential energy has the ability to cause motion. 
Question: What is the most important change gravitational potential energy can have? (A) The ability to cause motion (B) Motion (C) Friction (D) Deliver make skateboarders move.
Example Output: A, B.

Example Input: Paragraph- Sent 1: Magnetism is the ability of a material to be attracted by a magnet.
Sent 2: It also include the ability for some material to act like a magnet.
Sent 3: No doubt youve handled refrigerator magnets.
Sent 4: You can see some in Figure 1.28.
Sent 5: You probably know they stick to a metal refrigerator.
Sent 6: This is what holds your homework up.
Sent 7: Maybe your little sisters drawings are hung on the fridge in this manner.
Sent 8: Do magnets stick to all materials?
Sent 9: Of course not.
Sent 10: You have probably checked and they do not stick to other surfaces.
Sent 11: They do not stick to wooden doors or glass windows.
Sent 12: Wood and glass are not attracted to a magnet.
Sent 13: Obviously, only certain materials are attracted to magnets. 
Question: Do Magnets stick to all materials? (A) Stick to fridge (B) No (C) Yes (D) Only certain materials are attracted to magnets (E) Magnets stick to all materials.
Example Output: B, D.

Example Input: Paragraph- Sent 1: Madrid, Spain (CNN) -- Relatives of a woman killed in a Spanish airline crash were erroneously given the remains of another victim, and then were asked by authorities to return them, CNN partner network CNN+ reported Thursday.
Sent 2: The victims of the crash were first laid out at a Madria convention center.
Sent 3: A Madrid judge has opened an investigation into the error, and judicial sources say the initial indication is that the mixup occurred not in the proper identification of the victim, but in delivering the wrong remains to the family in question, CNN+ reported.
Sent 4: The family Wednesday received an urn numbered 104, and were told it contained the ashes of their loved one, Pilar Gonzalez Ferreira, who died in the crash.
Sent 5: But as the family was preparing to leave Madrid, officials called to tell them about the error and asked for the return of urn 104, CNN+ reported.
Sent 6: Instead of urn 104, the family was supposed to have received urn 134, which actually contains the remains of Pilar Gonzalez, CNN+ reported, citing judicial sources and another family which also lost a relative in the crash.
Sent 7: The Spanair MD82 jet crashed last week at Madrid's airport as the plane was trying to take off, killing 154 people.
Sent 8: The aircraft, bound for Spain's Canary Islands, managed to rise only slightly before coming down quickly to the right of the runway, its tail section hitting the ground first, just off the asphalt.
Sent 9: Then the out-of-control plane skidded and bounced at least three times as it careered 1,200 meters (3,840 feet) across uneven terrain and exploded, coming to rest in a gully, a top official of the investigative commission told a news conference in Madrid on Tuesday.
Sent 10: Many of the bodies were badly charred from the fire, and authorities have used DNA samples to carry out numerous identifications. 
Question: Where was the Spanish MD82 bound for when the crash occurred? (A) Spain's Barcelona (B) Canary Islands (C) Spain's Canary Islands (D) Secret service.
Example Output:
B, C.

