Concept:In meeting procedures, "adjourn" means to suspend or bring a meeting to a close, often when a quorum is not present.Explanation:The phrase "could not form a quorum" shows the meeting could not legally continue."Postponed" means rescheduled to a later fixed time, not necessarily due to quorum issues."Adjourned" means formally stopped or suspended, and "indefinitely" means without setting a new date.Thus "adjourned" fits the context of suspending the meeting because there was no quorum.Answer:C. adjourned