Answer: Option (a) is the correct answer.
Step-by-step explanation:
A compound formed by sharing of electrons is known as a covalent compound.
A covalent compound has weak intermolecular forces due to which it is brittle in nature. Hence, when we hit hammer on a covalent compound then it breaks easily.
Thus, we can conclude that when a hammer strikes a compound formed by covalent bonds, then most likely it will break into many pieces.