The motions to rescind or amend something previously adopted require what type of vote if previous notice is not given?

The correct choice is a two-thirds vote or a majority of the entire membership when previous notice is not given for the motions to rescind or amend something previously adopted. This requirement ensures that a significant majority of members agree with the change, reflecting the importance of stability in proceedings and protecting the original decision made by the assembly.

Rescinding or amending a prior decision can significantly impact the group's activities or policies, so a higher threshold for approval is rational. The rationale here is that since members may not have had prior notice of the proposal to change or eliminate a decision, it’s necessary to secure broader support to confirm that the change truly reflects the current will of the majority while also respecting the earlier decision.

Other voting options, like a simple majority or a plurality vote, do not provide enough consensus in circumstances where a significant policy change is occurring. Unanimous consent, while expressing complete agreement, is often impractical in larger bodies and not typically required for such motions. Thus, requiring either a two-thirds majority or a majority of the entire membership strikes a balance between enabling change and ensuring that existing decisions are not easily overturned.