Final answer:
A U.S. Senator must be at least 30 years old, a U.S. citizen for at least nine years, and an inhabitant of the state they will represent. Being a current member of the House of Representatives is not a requirement for becoming a Senator.
Step-by-step explanation:
To qualify to be a member of the U.S. Senate, a person must meet specific requirements outlined in the U.S. Constitution. Among these requirements, a senator must be at least 30 years old, have been a U.S. citizen for at least nine years, and must be an inhabitant of the state they wish to represent when elected. Therefore, the correct answer is that a senator does not have to be a current member of the U.S. House of Representatives to qualify for the Senate. The requirements of being a 'natural-born citizen' apply to the office of the President, not the Senate.