What motivated President Franklin D. Roosevelt to issue an executive order preventing any company with a federal contract from discriminating against potential employees based on race? A) African Americans employed by the city of Washington, DC, threatened to go on strike. B) Protests by African American defense workers threatened to shut down the defense industry. C) Minority leaders threatened to lead a march on Washington, DC, on behalf of African Americans. D) Many northern factories were shut down after African American activists chained themselves to the front doors.