What happens to a runner at third base when obstruction occurs while rounding the base?

When obstruction occurs while a runner is rounding third base, the correct outcome is that the runner is awarded home plate. This rule is in place to protect the runner from any interference that could impede their ability to reach the next base safely, particularly in the case of obstruction while rounding the base. If the umpire determines that the obstruction affected the runner’s ability to advance, they will grant them the opportunity to continue to home plate, ensuring that they have the chance to complete their run without being penalized by the obstruction.

In this scenario, since the obstruction directly impacts the runner's progress toward home, awarding home plate provides a remedy for the disruption. The other potential outcomes do not appropriately address the situation where a runner's progress is unlawfully impeded by an obstruction—thereby making awarding home plate the most fitting resolution.