(C) The correct answer is $(C)$. Diamond is an allotrope of carbon and consists of only carbon atoms,making it a pure substance composed of a single e

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(C) The correct answer is $(C)$. Diamond is an allotrope of carbon and consists of only carbon atoms,making it a pure substance composed of a single element. Marble is calcium carbonate $(CaCO_3)$,sand is silicon dioxide $(SiO_2)$,and glass is a mixture of various silicates.