Executive Order 9066 represented a significant challenge for:

A. military recruitment.

B. national security

C. civil liberties

D. American neutrality

The correct answer is C. Executive Order 9066 represented a significant challenge for civil liberties in the United States.

Explanation:

On February 19, 1942, President Franklin D. Roosevelt signed Executive Order No. 9066, authorizing the Department of War to delimit military areas where the permanence of ethnic Japanese would be decided by Secretary of War Henry Stimson. It was latter clarified that the descendants of Italians should not be disturbed, and that only some German refugees should receive consideration.

An appeal filed by human rights organizations attempted to challenge the government's right to lock up people on ethnic grounds, but the United States Supreme Court rejected the petition.

This Executive Order meant a serious violation of the civil liberties of the American citizens, since their right to freedom was deprived without having committed a prior crime, that is, they were locked up simply because they belonged to a certain ethnic group.