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: Deer are less safe in the woods because wolves (A) have fur (B) howl (C) have claws (D) have tails
Example Output: C

Example Input: an example of converting potential energy to kinetic energy is (A) a resting bird (B) a still rock (C) our own sun (D) cars spinning tires
Example Output: D

Example Input: Thick feathers can be used for (A) climbing, cracking nuts and peeling fruit skins. (B) courtship and looking for food (C) killing prey, preening and feeding young (D) staying weatherproof, flexible and free of bacteria
Example Output:
D