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: A plant needing to photosynthesize will best be able to (A) in a roofless room (B) in a cardboard box (C) in a windowless room (D) in a car with tinted windows
Example Output: A

Example Input: If birds are singing, the sun is shining, and temps are high, then (A) daylight is short (B) luminescence is long (C) winter is here (D) nights are freezing
Example Output:
B