What happened to the scheduled lunch?

The selected answer correctly conveys that the scheduled lunch has been postponed to a later time, specifically until the next week. The phrase "put off" is synonymous with "postponed," indicating that the lunch will take place, but at a later date than initially planned. This choice captures both the context of the lunch not occurring as originally scheduled and provides clarity that it is not canceled entirely, as it indicates a new date.

In contrast, the other options do not accurately reflect the situation. One option suggests the lunch was canceled without reason, which is not the case since it is rescheduled. Another indicates that it was moved to next week, which is similar but less specific than stating it has been put off or postponed, which adds nuance. Lastly, stating that the lunch was planned to be served later today contradicts the context of rescheduling, as it implies that it will still happen today rather than next week.