Final answer:
The phrase 'Living in the United States for the past eight years' goes against the requirement of being a citizen for at least nine years necessary to become a US Senator.
Step-by-step explanation:
The criteria necessary to become a US Senator include being at least thirty years old, being a citizen for at least nine years, and being an inhabitant of the state you will represent at the time of election. None of the options provided directly suggests that the candidate fails to meet these criteria. However, options a, b, c, and d do not contain any information that directly affirms the individual fulfills the age, citizenship duration, and state residency requirements to become a Senator. For instance, 'Living in the United States for the past eight years' implies that the individual does not meet the requirement of being a citizen for at least nine years.