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: This can be used to light up a light bulb (A) grass (B) dirt (C) stones. (D) biofuel
Example Output: D

Example Input: People can touch something to see if it's (A) shiny (B) red (C) striped (D) wrinkled
Example Output: D

Example Input: A large crevasse was carved in the western United States over many (A) glaciers (B) mountains (C) rainstorms (D) years
Example Output:
D