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 skill some humans have is (A) ten fingers (B) vision (C) heart beating (D) talking
Example Output: D

Example Input: Which is competition? (A) a giraffe eats the highest leaves (B) a bear takes a salmon from the stream (C) a shark eats a tuna that an orca was hunting (D) a slug eats a blade of grass
Example Output: C

Example Input: Which is likeliest to decay? (A) rock (B) radio waves (C) steel (D) a rhinoceros
Example Output:
D