The answer to your question would most likely be C. Mainly because, the US Congress act to regulate business practices is when Congress passed laws that ensured workplace safety.
The answer is C, the US successfully tested an atomic bomb.
I believe that they're
( A ) a weak national economy
( B ) agricultural overproduction
( D ) stock market stability
( E ) overextended credit
Its a market base i dont know why but if i have a better reason i will tell you thank you.