The correct answer is A. symphony.
A play is a dramatic work that is performed by actors on a stage. A concert is a musical performance that is given by musicians. A symphony is a large-scale musical composition that is typically performed by an orchestra.
The relationship between a play and an actor is similar to the relationship between a concert and a musician. In both cases, the performer is responsible for bringing the work to life. The actor interprets the playwright’s words and actions, while the musician interprets the composer’s notes.
The other options are incorrect because they do not accurately reflect the relationship between a play and an actor. A piano is a musical instrument, not a performer. Percussion is a type of musical instrument, not a performer.