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: Paragraph- Sent 1: Obama was born on August 4, 1961, at Kapiʻolani Maternity & Gynecological Hospital in Honolulu, Hawaii.
Sent 2: He is the only President to have been born in Hawaii.
Sent 3: He was born to a white mother and a black father.
Sent 4: His mother, Ann Dunham (1942-1995), was born in Wichita, Kansas, of mostly English descent, with some German, Irish, Scottish, Swiss, and Welsh ancestry. Question: How old was Obama's mother when he was born? (A) teenager (B) in his 40s (C) mid 20s (D) almost twenty.
Example solution: D.
Example explanation: Obama was born in 1961. His mother was born in 1942 and 1961-1942=19. Therefore, "almost twenty" answers the question sufficiently.

Problem: Paragraph- Sent 1: Earthquakes seemed to outline a special feature of earth's crust.
Sent 2: Earthquakes let scientists know where the crust was moving.
Sent 3: This led to the discovery that the Earths crust was broken up into regions, or plates.
Sent 4: Earthquakes happen most often along these plate boundaries.
Sent 5: This was evidence that continents can move.
Sent 6: The movements of the plates are called plate tectonics.
Sent 7: The Earths crust is divided into plates.
Sent 8: There are about a dozen large plates and several small ones.
Sent 9: Each plate is named for the continent or ocean basin it contains.
Sent 10: Scientists know he plates are in motion.
Sent 11: They now know the direction and speed of this motion .
Sent 12: Plates dont move very fast.
Sent 13: They move only a few centimeters a year.
Sent 14: This is about the same rate fingernails grow.
Sent 15: So you might wonder, what could cause this motion?
Sent 16: What supplies the energy to cause this change?. 
Question: How did scientists learn about the Earth's plates? (A) Regions (B) Movement of earth's crust (C) Earthquakes (D) Direction of plate movement (E) Earthquakes seemed to outline a special feature of earths crust, showing them where the crust was moving.

Solution: B, C, E.