Reflecting the Influence of Darwin on Many Intellectuals of His

Reflecting the influence of Darwin on many intellectuals of his day, Eliot devised a plan of barring unmarried southern and eastern Europeans from immigrating to the United States for what reason?

A) They were coming from countries that did not have good relations with the United States.
B) Married people were socially more stable and less likely to remain unemployed.
C) Married, they would be a lesser threat to the American gene pool.
D) He believed that single immigrants would send more money made in America to their families.