When can an assistant coach enter the coaching zone?

The correct choice is determined by the rules governing the conduct of assistant coaches during a volleyball match. An assistant coach is allowed to enter the coaching zone during a dead ball, which ensures that they can communicate with players at crucial points without disrupting the flow of the game. This rule stipulates that the entry must occur when it is not impacting gameplay, specifically during a dead ball situation.

The condition that no other assistant is standing supports the need for maintaining order and clear communication within the coaching area. This ensures that only one assistant is providing feedback or interaction with the players at any given time, which helps in minimizing confusion and maintaining focus.

The other circumstances listed do not align with this rule: entering after a point is scored may often coincide with a transition to the next play and could lead to disorganization on the court. Being allowed to enter only at the beginning of the match would unnecessarily limit an assistant's involvement and ability to support their team throughout the game. Lastly, permitting entry whenever they choose could lead to disruptions and compromise the game's integrity, as constant movement in the coaching zone could distract players and officials alike. Thus, the specified condition for entering during a dead ball without interference from another assistant aligns best with the regulatory framework for volleyball coaching.