What is the underlined word and what are the options? I can help you then.
The Civil Rights Act banned racial discrimination.
The 15th Amendment granted African Americans the right to vote. In the U.S. Supreme Court case Plessy v. Ferguson, it was ruled that racially separate facilities, if equal, did not violate the Constitution. Finally, in the U. S. Supreme Court case Brown v. Board of Education, it was ruled that racial segregation in public schools are unconstitutional.
Try skimming through the pages.
The answer is A. B is correct, C is a comma splice, and D is correct