Which line about elements, mixtures and compounds is correct?
- Ametallic element: copper; non-metallic element: methane; mixture: brass; compound: sulfur
- Bmetallic element: brass; non-metallic element: sulfur; mixture: copper; compound: methane
- Cmetallic element: copper; non-metallic element: sulfur; mixture: brass; compound: methane
- Dmetallic element: brass; non-metallic element: methane; mixture: copper; compound: sulfur