What must a member of the U.S. Senate have in terms of age and citizenship?

A member of the U.S. Senate is required to be at least thirty years old and have been a U.S. citizen for nine years. This requirement is outlined in the U.S. Constitution, specifically in Article I, Section 3, which establishes the qualifications for senators.

The age requirement ensures that senators have a certain level of maturity and life experience, which is significant given the responsibilities of representing a state in the legislative process. The stipulation of citizenship duration aims to ensure that senators have a deep understanding of American values and governance, derived from a long-term commitment to the country.

Thus, the correct answer reflects these constitutional qualifications, which are crucial for maintaining the integrity and effectiveness of the Senate as a deliberative body.