Music appreciation ... A small group of instruments in which each player plays his or her own part is called a/an

A. choir. B. chamber ensemble. C. orchestra. D. wind ensemble.

C. orchestra is the correct answer

A small group of instruments in which each player plays his or her own part is called a B. chamber ensemble.

The difference between a chamber ensemble and an orchestra is in the size - a chamber ensemble is a small group of instruments, whereas an orchestra is a large one. A choir refers to singers, and a wind ensemble is one single type of an instrument played by numerous people.