What measures can be taken during picnics to reduce the risk of foodborne illnesses?

The correct choice emphasizes the importance of temperature control and proper food handling practices during picnics to minimize the risk of foodborne illnesses. Keeping food either hot (above 140°F) or cold (below 40°F) is essential because bacteria can multiply rapidly in the "danger zone" between these temperatures. Serving food quickly reduces the time that it sits out, further lowering the risk of bacterial growth.

Furthermore, maintaining a separation between raw and cooked foods is vital. This practice helps prevent cross-contamination, which can transfer harmful pathogens from raw foods to ready-to-eat items. Using separate utensils and containers for raw and cooked foods further enhances safety.

The other options do not adhere to safe food handling guidelines. Keeping food out at room temperature allows for dangerous bacterial growth. Allowing food to cool naturally could expose it to temperatures where bacteria thrive and may lead to food safety hazards. Serving food buffet style without any precautions would likely increase the risk of contamination as guests serve themselves, possibly leading to improper handling of utensils or cross-contact among various food items. Therefore, the measures in the correct choice are aligned with best practices for food safety, especially in settings like picnics where maintaining temperature control can be challenging.