In which direction can force be applied in connection with the goal line?

The focus of this question revolves around the application of force regarding a player's position in relation to the goal line. When considering how force can be applied, it's essential to understand the rules regarding a player's movement relative to the end zone.

Applying force in only one direction into the end zone aligns with the fundamental goal of advancing the ball towards the opponent's end zone for a touchdown. Players can push, carry, or drive the ball across the goal line into the end zone, which is a specific directional application correlated with scoring plays.

The other options suggest multiple or different applications of force that do not accurately reflect the context behind advancing towards the goal line. For instance, applying force from the end zone onto the field does not occur during active play aimed at scoring, and force from any part of the field into the sideline does not pertain to scoring actions. Also, two directions into the end zone would imply a back-and-forth motion that contradicts the nature of advancing towards a single goal line for a score. Thus, the only valid option involves singularly applying force into the end zone for a score.