Someone argues that he or she doesn't drink tap water because it contains thousands of molecules of some impurity in each glass. How would you respond in defense of the water's purity, if it indeed does contain thousands of molecules of some impurity per glass?
A. The water contains water molecules and each water molecule is pure.
B. Compared to the billions and billions of water molecules, a thousand molecules of something else is practically nothing.
C. There's no defense. If the water contains impurities, it should not be drunk.
D. Impurities aren't necessarily bad, in fact, they may be good for you.
Answer: B
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