What is the best way to combine sentence 20 and 21?

Question 5 options:

All Americans must have the right to vote; we are going to give them that right.

All Americans must have the right to vote and we are going to give them that right.

All Americans must have the right to vote, and we are going to give all Americans the right to vote.

All Americans must have the right to vote and, we are going to give them that right to vote.