The correct answer is C) ten years. The term of validity for a ship station license for a radiotelephone is 10 years, as per the Federal Communications Commission (FCC) regulations. The FCC is responsible for issuing and managing ship station licenses, which authorize the operation of radio equipment on board vessels. These licenses are valid for a 10-year period, after which they must be renewed. The other options are incorrect because A) one year is too short, B) two years is also too short, and D) the life of the vessel does not accurately reflect the regulatory requirement of a 10-year license term.