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").

Input: Consider Input: The rhino population is smaller than before because (A) cars crashed into rhinos (B) lions have become more effective at hunting rhinos (C) global warming has increased temperatures (D) people use parts for health remedies

Output: D


Input: Consider 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.

Output: C


Input: Consider Input: What changes an ecosystem? (A) sunbathing (B) rock climbing (C) extracting coal (D) swimming


Output: C