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: Sunlight is a source of (A) wind energy (B) warmth (C) frigid temperatures (D) moonlight
Example Output: B

Example Input: A kitten in a hot environment has little to zero ability to (A) take a short nap (B) be very warmed up (C) adjust its internal temperature (D) lap up some water
Example Output: C

Example Input: The location of most C02 is pulled from the air (A) by greenery (B) by detectors (C) by scientists (D) by people
Example Output:
A