Giant covalent are characterized by having high melting and boiling points as well as being solid at room temperature. Hence, option C is correct.
A covalent bond shares one or more pairs of electrons between two atoms.
Giant covalent structure:
Polythene: long chains of atoms that are able to rotate along the bonding axis.
Graphite: layers of (hexagonal) carbon sheets; each individual sheet are rigid (allows no rotation.)
Silicon dioxide: three-dimensional (tetrahedral) network of carbon and oxygen atoms; the entire network is very rigid (allows no rotation.)
Diamond: three-dimensional (tetrahedral) network of carbon atoms and is very rigid.
Hence, giant covalent are characterized by having high melting and boiling points as well as being solid at room temperature.
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