What action does the plate umpire take if the visiting team's head coach has not listed all substitutes on the lineup card?

The correct response involves the plate umpire not accepting the lineup card until all substitutes are listed. This action is rooted in the necessity for clarity and compliance with the rules governing the game. A complete lineup card, which includes all players and substitutes, is essential for proper game management, allowing both teams and the umpires to know exactly who is eligible to play. If the visiting team’s head coach has not included all substitutes, it creates ambiguity that could complicate substitutions during the game and disrupt the flow of play. By ensuring that all substitutes are listed before the game starts, the umpire upholds the integrity of the game and ensures that all procedural requirements are met prior to the action on the field. This protocol reflects the NFHS's emphasis on proper game management and adherence to established rules, which facilitates a fair and organized contest.