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: What is an example of protecting the environment? (A) flushing the toilet twice (B) using water flow limiter (C) driving shorter trips more often (D) using fancy, more expensive paper
Example Output: B

Example Input: Which is nonmagnetic? (A) nail (B) washing machine (C) traffic cone (D) refrigerator
Example Output: C

Example Input: pushing an object requires (A) studying (B) dancing (C) singing (D) exherted effort
Example Output:
D