How Does a Permeable Sandstone Compare to a Karst Limestone

Multiple Choice

How does a permeable sandstone compare to a karst limestone in terms of groundwater flow?

A) Flow is faster in the sandstone so pollution is more of a threat.
B) Flow is faster in the limestone so pollution is less of a threat.
C) Flow is faster in the limestone so pollution is more of a threat.
D) Flow is faster in the sandstone so pollution is less of a threat.