I think is A not actually sure
If you are talking about books, then there are two important American classics that were written in 1947, so I guess you can choose either one of them:
1. A Streetcar Named Desire, written by Tennessee Williams
2. The Pearl, written by John Steinbeck
If you are not talking about books, then you should tell us what you mean by classics.
Answer:
An aerophone is any musical instrument that produces sound primarily by causing a body of air to vibrate without the use of strings or membranes and without the vibration of the instrument itself adding considerably to the sound. An idiophone is any musical instrument that creates sound primarily by the vibration of the instrument itself, without the use of air flow (as with aerophones), strings (chordophones), membranes (membranophones) or electricity (electrophones).
Explanation: