How old do citizens have to be to vote for President?

To vote for President in the United States, citizens must be at least eighteen years old. This age requirement is established by the 26th Amendment to the U.S. Constitution, ratified in 1971, which ensures that citizens who are eighteen years of age or older cannot be denied the right to vote based on age. The intention behind lowering the voting age to eighteen was influenced by the argument that if individuals are old enough to be drafted for military service, they should also be considered mature enough to participate in the electoral process.

While some states have laws allowing individuals younger than eighteen to pre-register to vote or to vote in primary elections as sixteen or seventeen-year-olds, the official and federal requirement for voting in a general presidential election is that individuals must be at least eighteen years old. This is where option "B" aligns perfectly with the established legal framework governing voting age in the United States.