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: A star produces light energy and heat because it has a variety of (A) moon rotation causing friction (B) light energy flowing to earth (C) reactions of nuclear form (D) global warming caused by co2
Example Output: C

Example Input: Which animal travels great distance as part of its instinctive behavior? (A) a raven (B) a bear (C) a chipmunk (D) a snake
Example Output: A

Example Input: Keeping shopping bags out of the dump affects the earth (A) neutrally (B) positively (C) negatively (D) very little
Example Output:
B