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: Mothers have many roles, one of which is (A) gestating and birthing (B) making good dinner (C) creating fun activities (D) watching the babies
Example Output: A

Example Input: When cutting down rain forests, it is important to keep in mind air quality. When too many trees are cut down in a given area, there may be decrease in the air's (A) quality (B) carbon dioxide (C) helium amounts (D) carbin dioyide levels
Example Output: A

Example Input: Sleet is made out of water that is (A) vapor (B) hot (C) liquid (D) cold
Example Output:
D