Which term refers to "an event whose occurrence is required in order for a sufficient condition to occur"?

The term that refers to "an event whose occurrence is required in order for a sufficient condition to occur" is "necessary." In logical reasoning, a necessary condition is something that must be true or must happen for another event or condition to occur.

In this context, the sufficient condition represents an event that, if it occurs, guarantees that another event (the necessary condition) will also occur. However, just because the sufficient condition is met does not imply that the necessary condition is also satisfied by itself; rather, the necessary condition must also be present for the outcome to happen.

To clarify the concept further, consider this: if the sufficient condition is viewed as the "trigger" for an outcome, the necessary condition can be understood as a prerequisite that must exist for that trigger to effectively produce the intended result. Therefore, identifying "necessary" as the correct term encapsulates this relationship accurately.