Based on the Borwn v. Board of Education of Topeka Supreme Court ruling, which of the following actions would be considered unconstitutional?
A. A civil rights activist is jailed for writing pamphlets urging African Americans to use nonviolence to resist racism.
B. A veteran of World War II receives federal aid to attend college and purchase a home in the suburbs.
C. A government official is fired from her job because of her participation in a rally organized by Communists.
D. A city government forces African American and white students to attend separate schools.