What type of clearance allows a pilot to make intermediate stops during a flight?

The correct answer to the question regarding a type of clearance that allows a pilot to make intermediate stops during a flight is "through clearance." This type of clearance is specifically designed for flights that will not only operate continuously from departure to destination but may also include multiple stops along the way.

Through clearance permits the pilot to follow a designated route while making scheduled or unscheduled stops, without the need for separate clearances for each leg of the journey. This is particularly useful for flights in which a pilot may need to refuel or pick up/drop off passengers at intermediate airports.

To clarify, special clearance typically refers to unique or non-standard authorizations that do not primarily address the need for intermediate stops. An en route clearance is usually more about the active phase of the flight and may not inherently provide latitude for stops. Final clearance generally refers to the specific instructions given to a pilot when they are approaching the final destination, which focuses on landing rather than on the ability to make multiple stops.