How old must someone be to take part in the senate

The Constitution prescribes that the Senate be composed of two senators from each State (therefore, the Senate currently has 100 Members) and that a senator must be at least thirty years of age, have been a citizen of the United States for nine years, and, when elected, be a resident of the State from which he or she

just finished this it is b. centrifugal force

the answer is c. to explore the louisiana purchase