according to article i, section 3 of the constitution, each senator must be\nan adult who is at least 25…

according to article i, section 3 of the constitution, each senator must be\nan adult who is at least 25 years old.\na lifetime resident of washington, dc.\na registered voter in ones state.\na us citizen for at least nine years.
Answer
Brief Explanations:
Article I, Section 3 of the US Constitution states that a senator must be a US citizen for at least nine years. A senator must be 30 - year - old or more (not 25), there is no requirement of being a lifetime resident of Washington, DC, and while being a registered voter is important for general participation, it's not a specific requirement for senatorship as per this section.
Answer:
a US citizen for at least nine years.