What is the ruling if a foul ball is prematurely called while the ball actually lands in fair territory?

The ruling in this scenario is that runners must return to their respective bases because when a foul ball is called, it is typically considered a dead ball situation. If the ball actually lands in fair territory, the play is treated as if it was an incorrect call. Since the ball was misjudged as a foul, any advancements made by the runners would typically be negated, and they must return to the positions they occupied prior to the pitch. This ensures that fairness is maintained, as the runners did not advance under the proper conditions of a fair ball.

Other options might suggest alternative outcomes, but they do not align with the standard ruling regarding this situation in baseball. For instance, declaring a batter out or calling for a review does not apply here since the focus is on ensuring that the running play is adjusted based on the proper call.