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: What are a source of fibers? (A) water (B) plantlife (C) rocks (D) air
Example Output: B

Example Input: The national symbol for the US would most likely eat (A) roaches (B) birds (C) mosquitoes (D) salmon
Example Output: D

Example Input: Wind is a resource we can renew because there is an (A) seven (B) endless supply (C) nothing (D) limited supply
Example Output:
B