Where does a run end according to NFHS rules?

A run in football, according to NFHS rules, ends where the ball becomes dead in possession. This means that as long as a runner maintains possession of the ball and is not declared down by contact or ruled out of bounds, the run continues until the play is whistled dead. There are various situations that can cause the ball to be declared dead, such as the runner being tackled, going out of bounds, or the play being otherwise stopped.

The other choices do not accurately reflect when a run ends. The first contact with the ground does not determine the end of a run; it is the runner's status and the play's conclusion that matters. The end of the game clock does not affect the end of a run unless it coincides with the end of the play, which would be a separate situation. Additionally, the line of scrimmage simply marks where the play starts and does not relate to when a run concludes. Understanding that a run ends when the ball becomes dead in possession is crucial for recognizing the flow of the game and the rules governing play continuations in football.