Final answer:
An area where vehicle movement is allowed without the need for clearance from ATC is known as an uncontrolled area.
Step-by-step explanation:
The term that describes an area where vehicle movement is allowed without the need for clearance from Air Traffic Control (ATC) is c) Uncontrolled Area. Unlike controlled airspace, where aircraft operation is subject to ATC approval or clearance, in an uncontrolled area, pilots are free to operate their aircraft without needing to communicate with air traffic controllers, typically following visual flight rules (VFR) in good weather conditions.