Who do Approach controllers take over from during aircraft descent?

Answer: C — Area controllers

Approach controllers take over from area controllers during an aircraft's descent. The role of an area controller is to manage en-route flights within a specific sector and ensure separation between aircraft. As an aircraft approaches its destination, it transitions from the en-route phase managed by the area controller to the descent phase managed by the approach controller. This transition is crucial for maintaining safe and efficient traffic flow as the aircraft nears the airport. In other contexts, the other roles involve different responsibilities. Departure controllers manage aircraft as they take off and climb out of an airport, air traffic managers deal with overall traffic management and strategy within a larger airspace system, and runway controllers oversee the operations on the runway itself. Each of these roles is critical in its respective phase of flight but does not cover the specific transition of control that occurs from area controllers to approach controllers during descent.