Which of the following is not a fire hazard when grilling?

Using a propane fire pit is not considered a fire hazard when grilling because it is designed specifically for safe outdoor cooking and heating. Unlike other options, which can contribute to fire risks, a propane fire pit operates within safety parameters and is constructed to minimize hazards. It has proper ignition and combustion control mechanisms, making it safer for outdoor use compared to scenarios involving flammable materials or poor maintenance.

In contrast, dry leaves around the grill, grease buildup, and fuel or liquid near the grill can significantly increase the risk of fire. Dry leaves act as kindling, potentially igniting from grill heat or sparks. Grease buildup can ignite if it comes into contact with an open flame, leading to flare-ups and possibly uncontrolled fires. Likewise, having fuel or liquid near the grill increases the chances of a fire starting from spills or accidents. Therefore, while using a propane fire pit recognizes safety protocols, the other options represent conditions that can create or exacerbate fire hazards.