(B) Carbon exists in nature in two primary states: combined forms and elemental forms.In combined forms,it is found as carbon dioxide,carbonates,and h

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(B) Carbon exists in nature in two primary states: combined forms and elemental forms.In combined forms,it is found as carbon dioxide,carbonates,and hydrogen carbonates.In elemental forms,carbon exists as allotropes,which include diamond and graphite.Therefore,the correct option is $B$.