How many utility straps are used in the fabrication of a single line lowering bridle for a Stokes basket?

A single line lowering bridle for a Stokes basket utilizes four utility straps to ensure the safe and effective lowering of the basket during rescue operations. Each strap plays a crucial role in distributing the load evenly and providing stability to the basket, which is essential when transporting individuals in distress. This design helps prevent tipping or swinging during the lowering process, thereby enhancing safety for both the victim and the rescuers.

In contrast, using fewer than four straps could compromise the structural integrity and operational safety of the bridle, potentially leading to failures in securing the basket during a critical operation. The choice of four straps is a well-established practice to maintain controlled lowering and secure transport, thus making it the correct answer.