Question

Dewayne, a pianist, wants to compare sound quality. Which scenario describes how he could do this?

Answer 1

The correct option is D.
When one is talking about comparing, one is referring to noticing the distinctions or differences between two things. In the question given above, sound quality is the factor that is been compared. To compare sound quality of piano, two pianos are needed. The sound quality is compared by playing the same note on two different pianos at the same volume and then decide on the piano whose sound quality is better.

Answer 2

D because you’re comparing two different pianos not two different notes.