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: Which can be used to pass information from one person to another? (A) an invention by Marconi (B) an invention by Newton (C) an invention by McCormick (D) an invention by Pasteur
Example Output: A

Example Input: Which of the following most likely led to certain rocks having less friction? (A) a babbling brook (B) people (C) a light wind (D) money
Example Output: A

Example Input: Peat is derived from (A) saplings and flowering seedlings (B) compaction of water and soil (C) compressing of deteriorating foliage (D) floating debris in swamp water
Example Output:
C