Which statement is true about most incidental motions?

Most incidental motions are indeed characterized by having specific rules regarding debate and reconsideration. While "C. They are not debatable" is often true in parliamentary procedure, the defining feature of incidental motions is that they are primarily used to address immediate procedural issues that arise during a meeting. This means they are usually related to the conduct of the meeting itself rather than the main subject matter, leading to straightforward handling without extensive discussion.

They are intended to help maintain order and ensure the proper conduct of the meeting, thus requiring swift resolution rather than debate. In many parliamentary systems, debates on incidental motions can disrupt the flow of the meeting, so limiting debate helps streamline procedures.

While some incidental motions may allow for brief discussion or clarification, the general rule is that they are not open to lengthy debate, differentiating them from other types of motions that do encourage more extensive discussion on the merits of the proposal at hand.