In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").

[EX Q]: An animal can use what to help find a partner (A) social networking and dating apps (B) beautiful vibrant tail plumage (C) asking animal friends for advice (D) meet ups and social gatherings
[EX A]: B

[EX Q]: Coral gets some help with algae for their (A) love (B) dating advice (C) happiness (D) vibrance
[EX A]: D

[EX Q]: A river can disappear over a period of time? (A) this is uncertain (B) this is sure (C) all of these (D) maybe
[EX A]:
B