Which statement describes repellents weathering without rainfall?

• A. Some repellents do not weather well even in the absence of rainfall
• B. All repellents weather well in sun
• C. They weather well only with humidity
• D. They never weather

Answer: (A)

Weathering describes how quickly a repellent loses effectiveness due to environmental exposure, not just rain. Sunlight, heat, and wind can degrade or volatilize active ingredients and carriers, so persistence varies from product to product. Some repellents are formulated to resist these factors, while others break down quickly even without rainfall. That variability is what makes the statement about some repellents not weathering well in the absence of rainfall the best choice. The other options overgeneralize or contradict observed differences in how products hold up under sun and dry conditions.