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: adding a direct flame to container of acid causes a (A) dormant cycle (B) lot of nothing (C) lower temperature (D) vapor expulsion
Example Output: D

Example Input: The topography of our only natural satellite's surface is (A) smooth (B) made of cheese (C) full of gold (D) mountainous
Example Output: D

Example Input: What is pulling your finger over a guitar string an example of? (A) tightening a guitar string (B) Stopping a musical sound (C) making music with an instrument (D) Putting a guitar away
Example Output:
C