How long does the runner rest before continuing to Route U?

The correct response, indicating that the runner's rest before continuing to Route U is negligible, suggests that the duration of the rest period is significantly brief or almost imperceptible. In scenarios involving high-intensity activities, such as running, it's common for athletes to take very short breaks that do not notably impact their overall performance or timing.

By labeling the rest as "negligible," it implies that the runner does not take a substantial pause that would affect the pace or timing of their run. This might occur if they are only taking a moment to hydrate or catch their breath briefly without stopping completely. The assessment of the duration as negligible helps emphasize that the runner maintains a continuous flow or minimal interruption in their activity.

Considering other options, if one were to imply longer rest durations, they could suggest a more significant break that might alter the runner’s momentum or performance adversely. Therefore, characterizing the rest as negligible accurately reflects the nature of the transition to Route U, focusing on the runner's commitment to maintaining their pace and forward motion.