Answer for 1: C. They hoped to use economic pressure to end segregation on the buses.
Answer for 2: It's either C or D. I'm going to take a guess and say that there is a typo. The answer is "Separate and unequal."
Answer for 3: A. President Eisenhower sent federal troops to escort and protect students.
Answer for 4: C. bus trips through the South promoting civil rights
Answer for 5: B