Under which of the following conditions are orchard heaters and wind machines most useful for preventing damaging low temperatures at ground level?

Question

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Orchard heaters and wind machines are most effective in clear and calm nights as they work by preventing the formation of frost on plants. The heaters warm up the air around the plants, while the wind machines circulate the warmer air from higher up in the atmosphere down to the ground. In cloudy and snowy nights, the cloud cover acts as insulation, preventing the escape of heat from the ground. In windy nights, the heaters and wind machines are less effective as the wind causes the warm air to disperse, making it harder to maintain a warm microclimate around the plants.

Under Which of the Following Conditions Are Orchard Heaters and Wind