From which point may a descent be initiated to the next lower minimum altitude when cleared for the VOR/DME RWY 36 approach?

The correct choice indicates that a descent can be initiated from the altitude of 8,900 feet when established on the PUC R-189. This is significant because it aligns with the altitude restrictions and requirements for the VOR/DME RWY 36 approach procedure. When cleared for this approach, pilots are expected to follow the published approach procedure, which includes specified altitudes at various points along the route.

In this case, the point indicated, the PUC R-189, is essential because it is likely a designated way-point or radial where descent is authorized according to the approach's criteria. This ensures that the aircraft remains at a safe altitude while transitioning to the next segment of the approach.

Properly managing descent altitudes during instrument approaches is critical for maintaining adequate terrain clearance, managing airspace, and ensuring the safety of the flight. Understanding where and when to begin the descent is vital for compliance with the approach procedures as outlined in the applicable approach plates.