It has been observed that sad music can trigger positive emotions

Why is the answer C for this question?

It has been observed that sad music can trigger positive emotions. Under an independent study conducted to study the emotions evoked by different kinds of music, 44 volunteers, including musicians and non-specialists, were made to listen to two pieces of music - one sad and one happy. It was found that most of the volunteers reported experiencing emotions such as relief and calmness while listening to the piece of sad music.

Which of the following, if true, most helps to explain the results of the study mentioned above?

(A) In various films centering on murder mysteries, happy music is used in the background of scenes that are visually disturbing.

(B) Participants were made to listen to the two pieces of music on different days.

(C) While listening to the piece of sad music, participants of the study felt the piece of sad music was more tragic and less romantic than they felt about the situations in their lives.

(D) Most of the participants heard the two pieces of music for the first time in their lives.

(E) Only a few people are good at separating the emotions experienced via art and those experienced in real life.