Answer:
Option C
Explanation
The shallow water consists of heavy metals.
Shallow water well receives water from the upper water table and hence they are more prone to ground contamination and discharges.
Therefore, all sources of shallow water will be inadequate for drinking, washing, farming etc. Hence, in order to get pure well, deep aquifers will be dug as water from greater depth are least exposed to surface contamination
Hence, option C is correct
