How was the Civil Rights Act of 1964 a check on the power of the states? a. The act required all states to follow federal guidelines, which resulted in state laws being overturned. b. The act required people to participate in civil rights protests and boycotts, which cost the states money. c. The act resulted in states passing more laws aimed at the restricting the rights of different groups. d. The act resulted in civil rights leaders pushing President Johnson and the federal government to take action.