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 one’s state.\na us citizen for at least nine years.
Answer
Answer:
D. a US citizen for at least nine years.
Brief Explanations:
Article I, Section 3 of the US Constitution sets requirements for senators, including being a US - citizen for at least nine years. The age requirement for a senator is 30 years old, not 25. There is no requirement to be a lifetime resident of Washington, DC, and while being a registered voter in one's state is relevant for many elections, it is not a specific requirement for senators as per this section.