Teacher: 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").
Teacher: Now, understand the problem? If you are still confused, see the following example:
Deserts are in extremely dry environments, so liquids will naturally be (A) rainbow (B) plentiful (C) meager (D) talented
Solution: C
Reason: This is a good example and the output correctly answers the question.

Now, solve this instance: Robert has only has power downstairs. In order to move the light from downstairs to his upstairs bedroom, he can (A) Just stay in the downstairs rooms (B) set up an array of drinking glasses (C) set up an array of mirrors (D) Unscrew a light bulb downstairs and move it upstairs
Student:
C