According to article i, section 3 of the constitution, each united state's senator must be

The correct answer is:

According to Article I, section 3 of the US Constitution, each Senator of the United States must be:

- At least thirty years of age,

- A citizen of the United States for nine years,

- A resident of the state for which he or she is chosen; he or she shall not, when elected, be an inhabitant of such state.

your answer would b. the missisipi river

hope i you : )

answer; the merit selection, also known as the missouri plan;