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: When a squid moves forward, water is (A) pushed directly behind it (B) pushed up and below it (C) evaporated by salt water (D) pushed in front of it
Example Output: A

Example Input: Which is most harmful to a human? (A) dynamite going off (B) reading email (C) balloons popping (D) opening a soda
Example Output: A

Example Input: Humans contribute to environmental pollution (A) by purchasing products made from recycled products (B) by switching to energy efficient appliances (C) by leaving behind refuse on public beaches (D) by frequently recycling paper and plastic
Example Output:
C