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: something in a cold place becomes what? (A) warmish (B) toasty (C) hot (D) chilly
Example Output: 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: If a thing is electrically insulated, then it is (A) wood inside, metal inside (B) a random mixture of materials (C) metal inside, metal outside (D) metal inside, other material outside
Example Output:
D