What should occur when a main motion has been passed or rejected?

When a main motion has been passed or rejected, the correct procedure involves a tap of the gavel. This action signifies the conclusion of the discussion regarding that particular motion. It serves to demonstrate that the assembly has reached a decision and can move on to the next item on the agenda or discussion. Tapping of the gavel is a standard practice in parliamentary procedure to maintain order and clarity in meetings, signaling that the decision has been finalized and is now officially in effect.

The other options, while they might seem appropriate in different contexts, do not align with the standard practice for concluding the discussion on a main motion. For instance, two taps of the gavel might indicate a different context, such as calling the meeting to order or restoring order after a disruption. Three taps of the gavel is often used to signal the beginning of a formal meeting. Thus, a single tap effectively communicates the resolution of the motion, making it the correct answer.