What was a speakeasy?

Aa place that illegally served alcohol during Prohibition
Ba town square where people could openly voice their complaints against the government
Ca device that was attached to a radio to get a better signal
Da style of dancing during the 1920s

Verified Answer :

A speakeasy, also called a blind pig or blind tiger, is an establishment that sells alcoholic beverages. Such establishments came into prominence in the United States during the Prohibition era (1920–1933, longer in some states).
A is the answer