The soil forming factor that has no relevance after soil reaches its maturity is

Correct option is A

Time is an important soil-forming factor during the process of soil development and horizon formation. Once soil reaches a mature stage, the influence of time becomes minimal compared to other factors. Climate, organisms, and topography continue to influence soil behavior even after maturity. Therefore, the soil-forming factor having no relevance after soil maturity is time.
Information booster: The five soil-forming factors are climate, organisms, relief, parent material, and time. Time determines the degree of soil profile development and horizon differentiation. Young soils show weak horizon development, while mature soils have well-developed profiles. Even after maturity, soils remain dynamic due to climatic variations and biological activity.
Why other options are incorrect: (b) Topography continues to affect drainage, erosion, and soil depth even in mature soils. (c) Climate constantly influences soil moisture, temperature, and weathering processes. (d) All of these is incorrect because only time loses relevance after soil maturity.