Why was the 1920s called the roaring twenties?
the decade ushered in the beginning of radio programming.
the decade ushered in several new and noisy fads.
the decade ushered in an era of prosperity and rebellion.
the decade ushered in an era of protest and dissatisfaction.

The answer is C. B could be a good answer but most of the 1920's was rebelling against conservative individuals by drinking alcohol in secret taverns when it was illegal and flappers resisting the conservative view of women. Clothes became more showy and dancing was a new fad.

I would say the answer is C, because people were beginning to protest alcohol and the stock market was booming.