Read the scenario and select the best answer.

Jamie is working as an assistant starter for a track and field invitational. He watches intently for situations that would require him to halt the starting process of the 100-meter dash that is about to begin. As the runners get set, Jamie notices that the finish judge is waving a yellow flag. He hesitates for a moment, and the next thing he knows, the gun has sounded and the runners are sprinting away.