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 filament that is in a glass container will be this when a switch is flipped to cause glass to glow: (A) dark (B) toasty (C) cold (D) icy

Output: B


Input: Consider Input: the presence of which of these is required for the formation of cavernous chambers? (A) some carbonated soda (B) some carbon dioxide (C) some carbonic acid (D) carbon monoxide gas

Output: C


Input: Consider Input: For what purpose does a plant light serve? (A) Mimic sunlight (B) Comfort them (C) Keep plants cool (D) Protect from bugs


Output: A