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 is likely to be hotter? (A) steaming coffee (B) the ocean (C) the forest (D) tepid water
Example Output: A

Example Input: A chemical reaction to vinegar or to baking soda can be caused by adding (A) air (B) bees (C) cola (D) sand
Example Output:
C