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: Which of the following most likely led to certain rocks having less friction? (A) a babbling brook (B) people (C) a light wind (D) money
Example Output: A

Example Input: Within a twenty four hour period, a person could experience (A) a globe's complete rotation (B) thirty hours of night (C) a day on Pluto (D) a year of schooling
Example Output: A

Example Input: which of these need to be present for a tectonic plate movement (A) a pool of molten lava (B) an ocean with fish (C) a river flowing north (D) a crack in the core
Example Output:
D