Which of the following should be avoided to ensure safe grilling practices?

Wearing loose clothing is a practice that should be avoided to ensure safe grilling. Loose clothing can pose a significant risk around an open flame or heat source, as it can easily catch fire or get caught on grill components. This is particularly important when working around high temperatures and open flames, where the risk of burns or accidents increases.

Each of the other options promotes safety: cooking in well-ventilated areas helps to prevent the buildup of hazardous fumes; checking food temperatures with a thermometer ensures that food is cooked to safe internal temperatures to prevent foodborne illnesses; and preheating the grill aids in achieving even cooking, helping to prevent undercooked food. Therefore, while these practices enhance safety, wearing loose clothing introduces unnecessary risks that should be avoided during grilling.