Answer:
D. The chemically treated water can contaminate residential drinking water.
Explanation:
Option D is the correct answer.
This is true because the passage revealed that fracking requires chemically treated water. The chemically treated water have been found to contaminate residential drinking water. The study carried out by Duke University revealed that there were more cases of contaminated water in fracking areas. This reveals that fracking has many harmful effects. Whenever a well is fracked, it also affects the availability of water to the local residents because 4 to 7 million gallons of water are required.