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: 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
Example Output: C

Example Input: Which process does the slate that comes from shale come from? (A) height (B) compression (C) gravity (D) steel
Example Output: B

Example Input: Putting heat on and around something like the following can cause a chemical reaction: (A) a marble slab (B) carrot cake batter (C) a stone (D) a dirt patch
Example Output:
B