Where must you pay the municipal fee to register a motor vehicle in New Hampshire?

Answer: C — Town/city clerk's office

In New Hampshire, the municipal fee for registering a motor vehicle must be paid at the town or city clerk's office. This is because vehicle registration is handled at the local level, and each municipality sets its own fees for registration based on local regulations and policies. When you go to the town or city clerk's office, they will provide you with the necessary forms and ensure that your registration is processed according to local requirements. This system facilitates a straightforward approach for residents, as they can directly engage with their local government regarding vehicle registrations. The other options do not reflect the correct procedure: the county office typically does not handle motor vehicle registrations, the DMV office is primarily for handling state-level registration, driver's licenses, and vehicle titles, and while some municipalities may offer online payment options, the actual registration must occur at the clerk's office.