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 Input: an animal needs to burn complex carbohydrates to (A) stay up (B) move (C) sit (D) sleep
Example Output: B

Example Input: A plant's roots break down rocks as the roots do what? (A) decay (B) grow old (C) develop (D) dcerease
Example Output: C

Example Input: If a person wants to help the environment, that person should (A) leave the faucet open. (B) watch a lot of TV (C) reuse pieces of paper (D) buy a new car
Example Output:
C