Why Are Springs in Karst Landscapes Particularly Vulnerable to Contamination

Multiple Choice

Why are springs in karst landscapes particularly vulnerable to contamination?

A) Natural sinkholes are commonly used as landfills.
B) Toxic metals dissolved out of limestone become concentrated in these springs.
C) Surface pollutants can easily enter and move through underground drainage systems.
D) Deep pumping of groundwater for agriculture draws pollutants from fertilizer into springs.
E) Spring water comes from stagnant underground pools where pollutants concentrate.