Answer: A) It stopped states from preventing former slaves or poor people from voting.
Step-by-step explanation: In the given amendment we can see that it states that the United States or any State can't deny the right to vote to any person by the reason of failure to pay poll tax or other tax. The effect of this amendment is that it stopped states from preventing former slaves or poor people from voting, because this people were who usually couldn't pay their taxes. It also applies to any person who haven't paid their taxes.