Concept:The person who introduces or calls a boxer into the ring before a match is the announcer.Explanation:In boxing, the referee controls the actions inside the ring but does not call the boxers to enter.A starter is used mainly in races, not boxing.An umpire officiates games such as cricket or tennis, not professional boxing.It is the announcer who calls the boxer by name and introduces him to the spectators.Therefore, the most suitable word for gap -73- is "announcer."Answer:D. announcer