What happens to artesian aquifers if subjected to bore holes?

When artesian aquifers are subjected to bore holes, the structural integrity and protective layers of the aquifer can be compromised. Bore holes create pathways that can allow contaminants to enter the aquifer. This can happen because the drilling process can disrupt the natural barriers that typically shield the water within the aquifer from surface pollutants. Moreover, if the bore hole is poorly sealed or maintained, it can become a direct conduit for contaminated water or chemicals, especially from the land surface or nearby activities, further impacting the quality of the water.

In contrast, the other options do not accurately reflect the consequences of drilling bore holes in artesian aquifers. For instance, these actions do not enhance the aquifer's protection or improve water quality, but rather pose a risk for contamination, making the selected answer the most relevant and correct in this context.