Question

Which of the following contributed significantly to the economic boom in the U.S. during the 1920s?

O decrease in manufacturing
O communism
O mass production techniques
O prohibition

Answer 1

C) Mass production techniques

Answer 2

The main reasons for America's economic boom in the 1920s were technological progress which led to the mass production of goods, the electrification of America, new mass marketing techniques, the availability of cheap credit and increased employment which, in turn, created a huge amount of consumers.

so the answer would be C-Mass production techniques