Final answer:
Aircraft in Class G airspace are typically vectored only when requested by the pilot, as ATC services are not mandatory in this airspace unless specifically sought by the pilot or in emergencies.
Step-by-step explanation:
The question pertains to the conditions under which aircraft in Class G airspace are vectored. Aircraft in Class G airspace are not typically subject to air traffic control (ATC) services unless they request it. The correct answer is C) When requested by the pilot. In Class G airspace, ATC has limited authority, and vectored flight paths, which are navigational instructions provided by ATC, are usually not mandatory. Pilots can navigate freely as long as they comply with visual flight rules (VFR) or instrument flight rules (IFR), and any specific regulations of the airspace. However, in special circumstances such as an emergency or when a pilot specifically requests assistance for navigation or traffic advisories, ATC may provide vectors, even within Class G airspace.