Provided a ground rule does not supersede a rule book rule, it becomes in force when:

• A. Both coaches agree to the proposed ground rule.
• B. The umpire formulate the ground rules if the teams cannot agree.
• C. Both A & B.
• D. Neither A nor B.

Answer: (C)

Ground rules are local adjustments that must fit within the rule book and cannot override it. They become binding when one of two things happens: both coaches agree to the proposed ground rule, or, if they cannot agree, the umpire formulates the ground rules. This means either pathway can put the ground rule in force, so the option that reflects both possibilities is the best choice. For example, if the teams agree on a unique boundary, that becomes effective; if they can’t agree, the umpire sets the boundary.