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: Factories often add something to the environment that is (A) helpful (B) productive (C) sanitizing (D) posionous
Example Output: D

Example Input: A 40 foot wide hole is found in the dessert. It's shaped like a ball had hit it. What could have happened? (A) something from space entered the atmosphere (B) a lizard built the hole (C) the moon's gravity pulled sand out of the hole (D) a dust storm filled it in
Example Output: A

Example Input: How many times per 365.3 days does an equinox occur? (A) 3 (B) 1 (C) 2 (D) 4
Example Output:
C