A scan pattern may be started anywhere, but it must be ___________ and ___________.

The correct answer is that a scan pattern must be complete and continuous. This means that during flight, pilots should ensure that their visual scanning of the outside environment and instrument readings cover all necessary areas and continuously update their awareness.

A complete scan pattern ensures that no vital information is missed, such as other aircraft, weather conditions, or changes in the environment. Continuous scanning is essential because the conditions in the cockpit and the surrounding airspace can change rapidly, requiring the pilot's attention to remain fluid and responsive.

While other options may seem appealing in terms of importance, they do not encapsulate the necessity of covering all aspects repeatedly and consistently, which is crucial for safe flight operations. For instance, being quick or effective might prioritize speed over thoroughness, which can lead to critical oversights during flight.