How Did 1920s Immigration Policy Reflect the Concept of Race

How did 1920s immigration policy reflect the concept of race in the United States?

A) Native Americans were denied citizenship based on a biological definition of "inferiority in race."
B) Nonwhites were excluded in the calculation of immigration quotas.
C) The Supreme Court ruled in 1923 that Indian national Bhagat Singh was black, not "pure Aryan" as he claimed.
D) Southern and eastern Europeans were granted citizenship if they could prove their "whiteness."
E) The United States allowed an unrestricted number of "whites" from Europe to immigrate.