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: The cell of a plant when photosynthesizing may most require (A) access to roofless space (B) a complete vacuum in space (C) a room with blackened windows (D) dark basement living quarters
Example Output: A

Example Input: Which is most harmful to a human? (A) dynamite going off (B) reading email (C) balloons popping (D) opening a soda
Example Output: A

Example Input: Which has molecules? (A) a Popsicle (B) suicide (C) therapy (D) thoughts
Example Output:
A