Which of these was a reason for the collapse of the American economy which led to the Great Depression?

Responses
A Foreign governments began to boycott American-made goods.Foreign governments began to boycott American-made goods.
B Government control of the economy led to severe inflation.Government control of the economy led to severe inflation.
C Taxes were too high to support unemployment claims and social security payments.Taxes were too high to support unemployment claims and social security payments.
D The boom of the 1920's rested on a weak foundation since the prosperity was not enjoyed by all economic groups

D The boom of the 1920's rested on a weak foundation since the prosperity was not enjoyed by all economic groups.