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").

Input: Consider 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

Output: D


Input: Consider Input: Grooves in the ground are a sign of (A) sink holes (B) erosion (C) water accumulation (D) high traffic

Output: B


Input: Consider Input: Carbon dioxide can be found in what goes through the (A) neck (B) ears (C) eyes (D) brain


Output: A