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: A thermal insulator slows the transfer of what? (A) warmness (B) light (C) energy (D) liquid

Output: A


Input: Consider Input: Rocket engines can lift rockets because (A) of how much fuel they use (B) of how fast they are (C) of the power the hit the ground with (D) of how tall they are

Output: C


Input: Consider Input: Which is likely to rot? (A) flying birds (B) a formerly-living organism (C) compressed oxygen (D) a shiny rock


Output: B