If soil is replaced with concrete, how will that affect the movement of water?
 A. Concrete has a lower porosity, meaning that surface water flows into the groundwater more easily.
 B. Concrete has a lower porosity, meaning that surface water cannot flow into the groundwater easily.
 C. Concrete has a higher porosity, meaning that surface water flows into the groundwater more easily.
 D. Concrete has a higher porosity, meaning that surface water cannot flow into the groundwater easily.