Which statement gives the properties of both diamond and silicon(IV) oxide?
- AThey are brittle, with a low melting point, and are insoluble in water.
- BThey are hard, with a high melting point, and are electrical insulators.
- CThey are malleable, with a high melting point, and are electrical conductors.
- DThey are soft, with a low melting point, and are electrical insulators.