What action constitutes a center line violation?

• A. A player crosses the center line or interferes with the opponent’s court during play.
• B. A player serves from the back row.
• C. A ball touches the net.
• D. A player hits the ball twice.

Answer: (A)

Center line violations happen when a player crosses the vertical boundary into the opponent’s court or interferes with the opponent’s ability to play the ball. The center line is the dividing boundary between the two sides, and during a rally you may not reach across it to touch or disrupt the other team's space. If any part of the body crosses into that space or an action on your side interferes with the opponent’s play, a fault is called. That’s why the action described—crossing the center line or interfering with the opponent’s court during play—is the correct definition of a center line violation. The other options describe different rules (back-row serving is legal, ball touching the net can be part of a rally, and double contact is a separate violation).