Which of the following best explains the reason for the rise in the standard of living in the united states after world war ii?
a)the investment in fighting communism worldwide
b) greater productivity at lower costs
c)the creation of levittown
d)the passage of the equal rights amendment

B is the only logical answer here.

A would be money going out of the country > bad for the economy and the standard of living
C would help but it wouldn't significantly work; also, those homes were still costly (80,000 dollars in today's money).
D - the equal rights amenment is a proposal today, not history back in the day.

The answer to this question is a