Why were poor communities establish in US cities during the Great Depression called “Hoovervilles”?

A) to express thanks to president Herbert Hoover for his assistance in providing federal jobs to the unemployed
B) to praise president, Herbert Hoover for his programs designed to provide food and shelter for the poor
C) to convince President Herbert Hoover to support labor laws, improving working conditions in factories
D) to condemn president Herbert Hoovers lack of actions to help those affected by the economic collapse

D) to condemn president Herbert Hoover's lack of actions to help those affected by the economic collapse