_____ work involves sustained monitoring. It is mentally demanding and draws heavily on attention.

• A. Vigilance
• B. Situational awareness
• C. Decision making
• D. Communication

Answer: (A)

Maintaining focus over long periods to detect changes or potential threats is what this work demands. Vigilance is the ability to stay alert and continuously monitor for infrequent or subtle events, even as fatigue or distractions creep in. That sustained attention and mental effort are precisely what’s being described.

Situational awareness involves understanding the current environment and anticipating what might happen next, which is broader than just the need to keep watching for signals. Decision making centers on choosing a course of action after information is gathered, not the ongoing monitoring itself. Communication is about exchanging information, not the core task of staying alert and watching for changes.

So, the best fit is vigilance because it directly describes sustaining attention during continuous monitoring.