1. How long must candidates for senator have been citizens of the United States?

A at least four years

B at least two years

C at least six years

OD at least nine years

Answer is 9 years

D. At least nine years

The candidates of the senator should be D. nine years (At least).

Explanation:

The senate of United States includes the upper chamber which is Congress of United States along with the Representatives House; and the lower chamber comprises of legislature of the United States.

The Article 1, section 3 of the constitution states the basic three requirements for the senator candidate are:

The candidate must be 30 years old (at least). The candidate must have been United States citizens for the past nine years or more. The candidate should be state inhabitants when they are willing to represent at their election time.