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: What requires photosynthesis to grow? (A) hills (B) planets (C) flora (D) people
Example Output: C

Example Input: Which is true? (A) glaciers make depressions that water can pool in (B) lions hunt glaciers in the wild (C) glaciers are generally high temperature objects (D) glaciers can change directions rapidly for speed
Example Output: A

Example Input: Someone is driving at night. The day was warm, but now the night is cool, and there is a lot of mist that is difficult to see through. The mist is prevalent because (A) humidity from the day condensed as night progressed (B) warm air is usually found in daytime (C) it is always misty at night (D) the cool air makes everything feel warm
Example Output:
A