Which timing term implies immediacy in event occurrence?

The choice that conveys immediacy in event occurrence is "now." This term indicates that something is happening at the present moment, highlighting a sense of urgency or an immediate action that is taking place without delay. It firmly establishes the current timeframe, making it clear that the event is occurring at this very instance.

Other timing terms like "previously," "later," and "eventually" imply different sequences or delays in occurrence. "Previously" refers to a time before the present, while "later" suggests a future time but not immediately. "Eventually" implies that something will occur at some point in the future, often after a wait, rather than indicating any immediacy. Thus, "now" is the only term among the choices that clearly communicates that an event is happening right at this moment.