Which amendment limits the number of terms a President can serve?

The 22nd Amendment is the correct answer because it specifically establishes a limit on the number of terms a President of the United States can serve. Ratified in 1951, this amendment was enacted in response to Franklin D. Roosevelt's four-term presidency and aims to prevent any future president from serving more than two elected terms, or a maximum of ten years if they assume the presidency via succession partway through a term.

In contrast, the other amendments listed in the choices address different issues. The 21st Amendment repealed Prohibition, the 23rd Amendment granted residents of Washington, D.C., the right to vote in presidential elections, and the 24th Amendment prohibits poll taxes in federal elections. None of these amendments pertain to presidential term limits, which solidifies the 22nd Amendment's distinct role in governance regarding presidential tenure.