Covalent bonding occurs in both molecular and covalentnetworksolids. Which of the following statements bestexplains why these two kinds of solids differ so greatly intheir hardness and melting points?(a) The molecules in molecular solids have stronger covalentbonding than covalent-network solids do.(b) The molecules in molecular solids are held together byweak intermolecular interactions.(c) The atoms in covalent-network solids are more polarizablethan those in molecular solids.(d) Molecular solids are denser than covalent-networksolids.

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