Answer :
Final answer:
The runway environment as detailed in FAR 91.173 refers to the runway and its associated lighting and markings which are crucial for guiding pilots during takeoff and landing.
Explanation:
According to FAR 91.173, the Runway Environment is primarily defined by the runway and its associated lighting and markings (Option B). These components are crucial for guiding and providing necessary information to pilots during takeoff and landing. The runway environment may include items such as runway thresholds, centerline markings, touchdown zone markings, runway edge lights, and taxiway lights among others. The surrounding airport buildings or the approach lighting system, while part of the larger airport environment, are not strictly part of the runway environment.
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