Option B is correct because the textbook context clearly states that in limestone or dolomitic regions, 'Physical or mechanical removal of materials by moving groundwater is insignificant in developing landforms.' Instead, 'the surface water as well as groundwater through the chemical process of solution and precipitation deposition develop varieties of landforms.' The context explicitly mentions that solution and precipitation (chemical weathering processes) are active in limestones or dolomites, making chemical weathering dominant over mechanical processes in these regions. In contrast, arid regions experience significant mechanical weathering due to drastic diurnal temperature changes, and humid regions are dominated by running water erosion.