Final answer:
The correct answer is C) Silver Service Star, which is worn by service members in the United States military in lieu of a sixth campaign or service medal award.
Step-by-step explanation:
In the United States military, when a service member has been awarded a campaign or service medal five times, a silver service star is worn in lieu of a sixth award. Therefore, the correct answer is C) Silver Service Star. The silver service star is used to denote additional awards when wearing the actual medal is not practical. The system is designed to minimize the number of attachments on the ribbon of the medal or the ribbon bar. One silver star is equivalent to five bronze service stars.