Senators to the National Legislature Are Elected

Senators to the national legislature are elected

A) by a plurality vote in each state and the federal district.
B) on a staggered basis with two-thirds being elected one time and the other third four years later.
C) on a staggered basis with two-thirds being elected one time and the other third three years later.
D) every four years
E) through a series of primaries held in each state and the federal district.