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.
One example is below.
Q: 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.
A: D.
Rationale: Obama was born in 1961. His mother was born in 1942 and 1961-1942=19. Therefore, "almost twenty" answers the question sufficiently.
Q: Paragraph- Sent 1: Relying on an animal to come by is risky.
Sent 2: A flower may have to wait a long time for the right animals to come by.
Sent 3: What if one never passes close enough to the flower?
Sent 4: Hoping the wind will blow is also risky for a plant.
Sent 5: What if the wind does not blow?
Sent 6: What if the blowing pollen does not land on another flower?
Sent 7: The wind could even blow the pollen over the ocean where it is wasted.
Sent 8: Giving free nectar is costly.
Sent 9: It is not a good use of the plants energy.
Sent 10: A plant uses a lot of energy to produce nectar.
Sent 11: Some animals may just drink the nectar.
Sent 12: They may not carry off any pollen in return.
Sent 13: To improve their chances, plants evolved special traits.
Sent 14: For example, they developed ways to hide their nectar.
Sent 15: Only certain animals were able to get at the plants hidden nectar.
Sent 16: These specific animals might be more likely to visit only flowers of the same species.
Sent 17: This was also a benefit for some animals.
Sent 18: Animals also evolved special traits to get to the nectar. 
Question: How do animals pose a threat to pollination? (A) They block the wind (B) Don't take pollen to another plant (C) They adapted (D) They may drink the nectar or not carry off pollen from the plant in return (E) Animals just eat the pollen (F) Drink nectar without transferring pollen (G) They may not carry off any pollen in return (H) They trample plants.
A:
B, D, F, G.