One of the amendments to the Constitution about voting states that what age group can vote?

The amendment to the Constitution that addresses the voting age is the 26th Amendment, which was ratified in 1971. This amendment specifically states that citizens who are eighteen years of age or older cannot be denied the right to vote based on age. This change was largely a response to arguments that if individuals were old enough to be drafted for military service, they should also have the right to participate in the democratic process by voting.

The other age options listed are incorrect because they either set the voting age below eighteen, which does not align with the stipulations of the 26th Amendment, or reference an age that was applicable prior to this constitutional change. Therefore, eighteen years old is the recognized minimum voting age in the United States.