Question

cleaning an aquifer does no good if you do not also
a eliminate the pollution source
b stop using the groundwater as a water source
c drill test wells
d all of the above

Explanation:

Aquifer cleaning is only effective if the source of pollution is removed; otherwise, the aquifer will be re-contaminated. Stopping use of the groundwater or drilling test wells are not necessary for the cleaning to have long-term benefit.

Answer:

a. Eliminate the pollution source