Which of the Following Directly Led to the Passage of the Immigration

Which of the following directly led to the passage of the Immigration Act of 1924?

A) broken western alliances and betrayal during the Great War
B) the slowing levels of immigration into the United States after the Great War
C) many Americans' fears of foreign ideas such as socialism, communism, and anarchism
D) nineteenth-century policies such as the Monroe Doctrine regarding Latin America
E) the onset of the Great Depression and the lack of resources to house immigrants