When must a member second a motion for it to be considered?

A motion must be seconded before it can be considered by the assembly, which is why this choice is the correct answer. The purpose of requiring a second is to demonstrate that at least one other member believes the motion is worthy of discussion. This mechanism helps streamline the deliberative process and prevents the assembly from spending time on a motion that does not have sufficient support.

The requirement for a second is foundational to parliamentary procedure, as it aligns with the principles of meeting efficiency and member engagement. It encourages participation while ensuring that only viable motions are brought forward for discussion.

The other choices do not align with the established rules of parliamentary procedure. For instance, discussing a motion before it is seconded would not adhere to protocols and could lead to confusion. Similarly, a motion should not be contingent on a specific request from the chairman, nor can it be validly considered at the end of a meeting. These guidelines help maintain order and clarity in parliamentary discussions.