Detailed Instructions: In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").
Problem:Fact1: plucking a string can cause that string to vibrate, Fact2: For example, sound is a wave of vibrating air., Question: What results from plucking a string? (A) light waves (B) sound waves (C) guitar (D) friction (E) chemical changes (F) kinetic energy (G) mechanical (H) violinist
Solution:
B