Hello Griffin!
Your answer is C. i wish you the best of luck!
The Fifteenth Amendment was the initial phase in giving full voting rights to African Americans. Notwithstanding, Jim Crow laws made more confinements to these rights. With the entry of the Voting Rights Act, the Fifteenth Amendment was authorized as voting confinements were evacuated.
I believe it would C, because it will make the audience pay attention more to what he is saying in his speech.