The water testing kit is used for determining the color of water. The correct option is D.
Water tests look for inorganics such as iron, hardness minerals, and total dissolved solids (TDS), as well as specific contaminants such as lead, nitrates, and arsenic. Even though bacteria tests are limited, only look for coliform.
Water color indicates the presence of a variety of chemical and organic pollutants, including copper from plumbing systems, rust from iron pipes, algae, bacteria, and so forth.
Thus, the correct option is D.
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