According to CAR 602.26, where are parachute descents restricted without authorization?

The correct choice highlights that parachute descents are restricted in controlled airspace without prior authorization. Controlled airspace is designated airspace within which air traffic control (ATC) services are provided to differentiate between traffic and to enhance safety. Parachute descents within this airspace can interfere with aircraft operating under ATC control, creating potential hazards.

Operating in controlled airspace requires coordination with ATC to ensure all traffic can be managed safely. This regulation aims to minimize the risk of accidents and ensure that both parachutists and powered aircraft can operate without conflict.

While there may be restrictions in other areas—such as near populated locations or over specific types of infrastructure—the most critical and generalized restriction applicable to parachute descents is indeed within controlled airspace, making it essential for parachutists to obtain the necessary authorization before proceeding with a jump in these areas.