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: when sound reaches the ear , that sound can be heard, Fact2: Music is sound, sound is energy., Question: When can music be heard? (A) sound vibrations (B) when the music reaches the eye (C) when the ear is not working (D) when the music reaches the ear (E) reverberating noise (F) when the music dies (G) 70-75 degrees Fahrenheit (H) speed at which sound moves
D