Detailed Instructions: 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").
See one example below:
Problem: Deserts are in extremely dry environments, so liquids will naturally be (A) rainbow (B) plentiful (C) meager (D) talented
Solution: C
Explanation: This is a good example and the output correctly answers the question.

Problem: Just a few days ago, Beth waded into her family's pond. Now when she stepped off the bank the pond was hard and she could walk on the surface. What happened? (A) a cold front had moved into the area (B) The pond had drained into an underground river (C) There was a lot of algae on the pond's surface (D) It had rained the night before
Solution:
A