Which statement best explains the meaning of “one person, one vote”?
one person should not be allowed to vote twice.
a voter deserves one chance to vote.
a voter should vote only once a year.
all people's votes should count equally.

The statement that best explains the meaning of "one person, one vote" is D. All people's votes should count equally.

Explanation:

The One-Person, One-Vote Rule -also called one man, one vote- is a principle that establishes a person's voting power should be equivalent to another person's within the same state, meaning no vote should carry more weight than other. Therefore, one could say the One-Person, One-Vote Rule is not only a slogan, but also the application of the principal of political equality.

there are no options provided but you can choose among the following gender-neutral pronouns: zir, hir, eir, vis, tem, eir.

in the normal course of maintaining a pronoun-antecedent agreement, we could have used the words his or her but since we are also required to use gender-neutral language, we need to replace it with its equivalent gender-neutral pronoun.