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: Why was my son-in-law required to add rugs or carpeting to his upstairs apartment when the ground floor wasn't? (A) So it would look good then prospective renters took a tour (B) Because they didn't want him to scratch up the wood floors. (C) Because they didn't want the downstairs renters to be as likely to complain about noise (D) Because they didn't want to pay for carpeting themselves.
Example Output: C

Example Input: Max mixed some orange flavored powder in a glass of water until there it was dissolved. His sister tasted it and it tasted like (A) cola (B) dark chocolate milk (C) a citrus fruit (D) lemons and apples
Example Output: C

Example Input: A pollution source in a county may be (A) compost pile (B) grass seeds (C) recycling center (D) trash heap
Example Output:
D