Which of the following best describes a main motion?

A main motion is defined as a formal proposal made by a member of a meeting that introduces a new subject or topic for discussion. This type of motion is essential for guiding the direction of the meeting, allowing members to bring new ideas or decisions to the floor. Once the main motion is presented, it provides the basis for deliberation and debate among the participants, ultimately leading to a decision or vote.

In contrast, the other options represent different parliamentary procedures rather than the introduction of a new subject. For instance, amending the agenda does not introduce a new topic; it modifies the existing plan for the meeting. A motion to adjourn is a procedural motion aimed at ending the meeting, while requesting further information before voting pertains to the clarification of an existing motion rather than the introduction of a novel idea. Therefore, the best description of a main motion is one that introduces a new subject for discussion.