Concept:Soil water conservation is achieved through farming practices that reduce water loss from evaporation and runoff.
Explanation:Mulching covers the soil surface with plant remains, which helps to reduce evaporation.
Strip cropping slows the speed of running water, allowing it to soak into the soil.
Cover cropping shields the soil from direct rainfall impact and improves water retention.
Clean clearing removes protective vegetation and exposes the soil to drying.
Weeding only removes unwanted plants; it does not directly help save soil water.
Therefore, the most effective combination for conserving soil moisture is mulching, strip cropping and cover cropping.
Answer:A. mulching, strip cropping and cover cropping