Why did mass culture in the form of entertainment emerge in the 1920s?

A: Rising Wages and labor-saving appliances gave people more money and leisure time.
B: Car ownership allowed people to travel.
C: People had limited access to movies and watched the same few films repeatedly.
D; People had the same tastes during this period of history.

A: Rising Wages and labor-saving appliances gave people more money and leisure time.