The correct answer is B) Shade the container and periodically hose it down. This is the correct answer because in the absence of functional refrigeration, the best way to reduce the temperature rise and prevent spoilage of the air-cooled fruit is to provide external cooling through shading and periodic hosing down of the container. This helps to lower the container's exposure to direct sunlight and utilize the cooling effect of evaporation to maintain a lower internal temperature. The other options are not as effective in this situation. Discharging nitrogen (A) would not provide sufficient cooling, sealing ventilation and adding dry ice (C) could lead to improper atmosphere in the container, and spreading ice (D) may not be practical or maintain the temperature for the required duration.