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: Obstacles that might impede a dune are (A) God (B) emotions (C) cacti (D) cancers
Example Output: C

Example Input: In a bowl of water with the sun shining on it, what happens to the water after four hours? (A) the water is growing algae (B) there is less water (C) the water is dirty (D) there is more water
Example Output: B

Example Input: A way in which seeds are frequently spread is (A) pigs rolling in mud (B) floors being swept clean (C) people eating deli ham (D) voles consuming oak pips
Example Output:
D