The correct option highlights that tropical rainforests have highly weathered soils, often low in nutrient content due to rapid decomposition and nutrient cycling. Unlike tropical deciduous forests, where a dry season allows leaf fall and nutrient accumulation in the soil, tropical rainforests' continuous growth suppresses nutrient buildup and leads to leaching. Therefore, when rainforests are removed, the nutrient-poor soil significantly slows down regeneration, resulting in prolonged recovery times and reduced biodiversity.