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 makes a sound when you interact with it? (A) something invented by Pasteur (B) something invented by van Leeuwenhoek (C) something invented by Sax (D) something invented by Galileo
Example Output: C

Example Input: If you had a hammer, you would find ____ nails made of ____ (A) wood; wood (B) iron; wood (C) wood; iron (D) iron; iron
Example Output: D

Example Input: A person protecting the environment they have control over will most likely (A) block in their yard (B) salt their whole yard (C) burn trash in their yard (D) flood their whole yard
Example Output:
A