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").
Example: Deserts are in extremely dry environments, so liquids will naturally be (A) rainbow (B) plentiful (C) meager (D) talented
Example solution: C
Example explanation: This is a good example and the output correctly answers the question.

Problem: Birds feed their babies by (A) telepathy (B) flying (C) osmosis (D) regurgitation

Solution: D