The answer is B. I guess its right
An executive order is a legally binding order that is given by the American President to direct federal agencies to carry out some specific action in their execution of Congressionally adopted laws and policies. Whereas a law is a piece of legislation that has been agreed to by Congress.
Congress passed the Civil Rights Act of 1964 using this Constitutional authority and this was a c) protection of state's citizens. The Civil Rights Act of 1964 is defined as a "landmark piece of civil rights legislation in the United States that outlawed discrimination based on race, color, religion, sex, or national origin."