You will be given a definition of a task first, then some input of the task.
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").

Fact1: plucking a string can cause that string to vibrate, Fact2: How the sounds are made Vibrating strings provide the sound in stringed instruments., Question: Doing what can cause sound to be made in stringed instruments? (A) Movement (B) wind (C) striking (D) adding (E) playing (F) plucking (G) electrically (H) breaking
Output:
F