The flapper: a. represented a new political movement. b. demanded a return to earlier standards of behavior. c. epitomized the change in standards of sexual behavior. d. disapproved of smoking. e. represented a new economic radicalism.

c. epitomized the change in standards of sexual behavior.    

Explanation:

The word flappers was used to refer to a popular group of young women in the 1920s who lived for the moment and contrary to what society expects from women as that time. Some of their characteristic features was that they wore short skirts and make-up which were considered sensual, listened to jazz which was a man's thing as at then, they epitomized a change in standards of sexual behavior in that they flouted sexual norms and treated sex in a casual manner.