What must a player do if they touch a base before being out?

In baseball, if a player touches a base before being called out, they must maintain their position on that base until they are either contacted by the umpire or until the play is dead. This is important because it ensures that the game's flow is kept orderly and that the determination of base runners can be accurately assessed according to the rules. A player is not allowed to advance or leave that base without either being told by the umpire or until the situation dictates that they can do so, like in the case of a forced play or a play that allows them to advance safely.

Multiple-choice options represent different interpretations of the rules, but the choice pointing to the necessity of remaining on the base until contacted by the umpire reflects the proper protocol for the situation. This underscores the role of the umpire in officially determining the status of plays and the players involved, helping to avoid confusion and ensuring fair play.