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 did some ancient societies use to reflect light? (A) wood (B) plants (C) clothing (D) rocks
Example Output: D

Example Input: Which of the following items can perform photosynthesis? (A) a flying wasp (B) a speedy cheetah (C) wet dirt (D) a yellow tulip
Example Output: D

Example Input: where do arctic animals reside? (A) arctic fire (B) tropical jungles (C) chilly habitats (D) sahara habitats
Example Output:
C