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: A 40 foot wide hole is found in the dessert. It's shaped like a ball had hit it. What could have happened? (A) something from space entered the atmosphere (B) a lizard built the hole (C) the moon's gravity pulled sand out of the hole (D) a dust storm filled it in
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: Lungs are to hampsters as ________ are black tipped sharks. (A) gills (B) hearts (C) stomachs (D) fins
Example Output:
A