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").
Problem:Which causes the electric fan to work? (A) the blades run themselves (B) power outlets allow the blades to rotate (C) the air pushes the fan (D) power outlets allow the fan to think
Solution:
B