Soil moisture is limited in the grassland ecosystem because of:

Explanation

Grassland ecosystems often experience low precipitation and high evaporation, which together contribute to limited soil moisture. The low rainfall means there is not enough water input to compensate for the high rate of water loss due to evaporation. Option A correctly identifies this combination, leading to limited soil moisture.Option B is incorrect because while low precipitation would reduce soil moisture, low evaporation would retain some of it. Option C is incorrect because high precipitation would increase soil moisture, and low evaporation would conserve it. Option D is incorrect because high precipitation would generally increase soil moisture, even though high evaporation is present.