​Play is to actor as concert is to

Play is to actor as concert is to,

Lets check all options;

option (a): Piano (False)
The piano is a musical instrument. but a concert is not directly associated with just one specific instrument.

option (b): Percussion (False)
Percussion refers to a family of musical instruments like drums, cymbals, etc. like the piano, percussion instruments might be part of a concert, but they do not capture the performer’s role in the concert.

option (c): Musician (True)
A musician is someone who performs music, typically at a concert. Just as an actor performs in a play, a musician performs at a concert.

option (d): Symphony (False)
A symphony is a type of musical composition, often performed at a concert.While a symphony may be performed during a concert, it does not represent the performer.​​

So, option (c) is correct matching option

Thus, the correct answer is (c).