Solution

Explanation:

The bond which is formed due to sharing of electrons between two atoms is called a covalent bond.
Example of a covalent bond:
In case of $$H_2O$$ the electronic configuration of $$H$$ and $$O$$ are:
$$H=1s^1$$
$$O=1s^22s^22p^4$$.
So, $$O$$ needs two electrons to complete its octet, and $$H$$ needs one electron to achieve its complete duplet.
Thus, $$H$$ and $$O$$ both the species share their electrons and form two covalent bonds.
Final Answer: Covalent bond is formed by sharing of electrons. Hence, the correct answer is option $$C$$.