Which of the following statements is true ?  A) an element contains two or more compounds.  B) a compound contains two or more elements.  C) elements can be broken down into simpler substances.  D) distilled water is a pure substance that contains only one element. 

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A) an element contains two or more compounds.

False. Compounds, by definition, contain two or more elements, but elements contain only themselves.

B) a compound contains two or more elements.

True. It is the definition of a compound.

C) Elements can be broken down into simpler substances.

False. Elements cannot be broken (actually, they can be, but not by chemical methods).

D) distilled water is a pure substance that contains only one element.

False. Distilled water is (relatively) pure, but it remains a compound. Distillation is a physical process which cannot change compounds' composition.
Molecules of water, distilled or not, consist of oxygen (one part) and hydrogen (two parts).

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