DeShawn wants to conduct a scientific study on how land-clearing in his city may have affected the quality of the water. Which source of information would be most valuable to his research?
A. a recent city government report with data regarding how clean the water supply is
B. the opinion of a neighbor who has some knowledge on how to test city water for impurities
C. a survey given to the people of the city ten years ago on the possible effects of land-clearing on water
D. a recent political article stating that the water of the city should be filtered and cleaned

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