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: 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

Example Input: Which has molecules? (A) a Popsicle (B) suicide (C) therapy (D) thoughts
Example Output: A

Example Input: On what product might you find a reflector? (A) Xbox (B) Toyota (C) Samsung (D) Apple
Example Output:
B