Which Would Be the Most Prone to Surface Contamination from Runoff

Which would be the most prone to surface contamination from runoff and infiltration?

A) wells a few hundred metres uphill from septic systems in rugged mountainous terrain
B) deep confined aquifers directly below contaminated sites
C) shallow aquifers with thin soils or unconsolidated coarse overburden
D) an aquifer with a thick, overlying, unsaturated vadose zone

Correct Answer:

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