Choose the best answer of the following.
Someone argues that he or she doesn’t drink tap water because it contains thousands of impure atoms in each glass. How would you respond in defense of the water’s purity, if it indeed does contain thousands of atoms of some impurity per glass?
(a) Impurities aren’t necessarily bad; in fact, they may be good for you.
(b) The water contains water molecules, each of which is pure.
(c) There’s no defense. If the water contains impurities, it should not be drunk.
(d) Compared to the billions and billions of water molecules, a thousand atoms of something else is practically nothing.
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