On the basis of the description given classify each of the following solids as molecular, metallic, ionic, or covalent network. Explain why?

A. a lustrous, yellow solid that conducts electricity
B. a hard, black solid melting at 2350 degrees C to give a nonconducting liquid
C. a nonconducting, pink solid melting at 650 degrees C to give an electrically conducting liquid
D. red crystals having a characteristic odor and melting at 171 degrees C

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