Question

which factor affects the amount of runoff that occurs in an area?
land use
the water table
the saturation zone
amount of nutrients in soil

Explanation:

Land use affects runoff. For example, urban areas with concrete (impermeable surfaces) have more runoff than forested areas (permeable soil). The water table and saturation zone relate to groundwater, not surface runoff. Nutrient amount in soil doesn't directly impact runoff volume.

Answer:

land use