Under what condition does a member usually not speak while seated?

A member typically does not speak while seated in order to maintain decorum and facilitate orderly discussion during meetings. When members want to contribute to the discussion, they are generally expected to stand as a sign of respect and to ensure that their voice is given proper attention. This practice helps to prevent any confusion and ensures that the person speaking is visible to others, enhancing communication in the assembly.

The understanding that members should stand while speaking applies broadly, with very few exceptions allowed, such as in cases of disability or specific rules set by the assembly. These exceptions reinforce the principle that the norm is for members to rise when addressing the assembly, which fosters an atmosphere of formality and respect conducive to effective debate and deliberation.

In formal meetings, while there may be specific protocols regarding how and when members can speak, the underlying guideline remains that seated speaking is generally reserved for rare situations. This emphasizes the standard that has been established for the conduct of meetings in parliamentary procedures, thereby making option C the most accurate choice.