What indicates that debate is open for discussion?

The correct option indicates that debate is open for discussion when members are called to discuss a motion that has been proposed. This is a fundamental aspect of parliamentary procedure, where after a motion is put forward, it must be debated and discussed by members present before any decision can be made. The calling for discussion is a clear signal to all members that they have the opportunity to voice their opinions, ask questions, or contribute to the dialogue regarding the motion.

This process encourages participation and ensures that all viewpoints are considered before reaching a decision. By initiating discussion post-motion proposal, it underscores the democratic nature of parliamentary procedure, allowing every member to engage and influence the outcome.