Answer:
a. It was an era of sweeping change and new forms of entertainment
Step-by-step explanation:
The 1920s in the America was called Roaring Twenties because it was during this period that there was widespread change and defiance of old and established ways. People indulged in new styles of dancing and social culture, in the process rejecting old customs and societal standards.
Therefore, the 1920s were called the Roaring Twenties because it was an era of sweeping change and new forms of entertainment