I think the answer is D seems the most likely reason
The European nations that controlled territory bordering the United States are United Kingdom, Spain, France, and Russia or Union of Soviet Socialist Republics. They also compete for control over territory in the Americas because the United States of America had generally good soil where crops are planted.
The Civil Rights Act "ended segregation in public places and banned employment discrimination on the basis of race, color, religion, sex or national origin." ( https://www.history.com/topics/black-history/civil-rights-act P.G. 1)
