What did the Twenty-fourth Amendment to the Constitution change about voting?

It gave the vote to 18-20-year old citizens.

It gave the vote to women.

It prohibited poll taxes.

It gave the vote to freed slaves.

Twenty-fourth Amendment to the Constitution change about voting was related to prohibiting the Congress and the States from conditioning the citizens of their right to vote in federal elections on paying poll tax and other types taxes. They could now vote regardless of paying any kind of poll taxes. So correct option would be:

Option C: It prohibited poll taxes.