How can river flow generally be in a high rainfall region?

Correct answer: More water-rich

Direct answer: Option A is correct. Rainfall supplies water to the ground and streams. Some rain infiltrates the soil, while the rest becomes surface runoff and enters rivers. Therefore, when rainfall is high, a river may usually carry more water and have stronger flow, although the exact result also depends on season, soil, slope, vegetation, dams and evaporation. Option A says “more water-rich,” which is the general relationship asked here. Option B is wrong because completely dry rivers are more likely where water supply is absent, though even dry regions can sometimes have temporary floods. Option C is wrong because riverbeds are not always sandy; they may contain silt, gravel, clay or rocks. Option D is wrong because rivers in high-rainfall regions are not only icy; ice is associated with glaciers or very cold high mountains. The safe exam chain is: more rainfall → more runoff → generally greater river discharge. Memory cue: rainfall feeds rivers, but local conditions modify the result.