Which of the following is considered potentially hazardous in a dry storage area?

The correct answer identifies overhead drainage pipes as potentially hazardous in a dry storage area. The reason for this is that if these pipes leak, they can introduce moisture into the storage space, creating an environment conducive to the growth of harmful bacteria and mold. This moisture can affect stored food items, leading to spoilage and food safety issues.

In contrast, storing items on racks is a common practice intended to promote proper air circulation and minimize moisture accumulation. The presence of wood materials, while they can harbor bacteria if not cleaned properly, is not inherently hazardous as long as they are maintained properly and kept dry. Exposure to sunlight might affect some products like spices or oils, but it’s not a direct risk like a leaking drainage pipe, which poses more immediate contamination risks due to moisture. Therefore, considering the implications of how each factor affects food safety, overhead drainage pipes present the most significant concern in a dry storage area.