To take part in elections in Washington State, citizens must promise to vote in all elections. be at least 16 years of age. already be registered to vote. have first served in the military.

The correct answer is - already be registered to vote.

In order for a person to be able to vote in Washington State, that person has to a citizen of the United States of America, a resident of Washington State, and have at least 18 years of age.

Further, the person needs to register for the voting on time. The registration can be done in person, and that should be done at least eight days before the elections take place. Also, there's the option of registering by mail or online, but if that is the choice, then the person has to register 29 days before the elections take place.