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: As vehicles become more efficient petro consumption (A) increases (B) stops (C) decreases (D) stay the same
Example Output: C

Example Input: Which is likely to provide an undesired acquired characteristic for an organism? (A) a light scratch on its leg (B) learning to leave the nest (C) finding a potential mate (D) dipping a foot in magma
Example Output: D

Example Input: Which would likely be a chemical reaction (A) an ember (B) oil and water (C) steel and iron (D) play dog
Example Output:
A