a
Van der Waal's forces are weak intermolecular forces of attraction that exist in between molecules. It is the sum of attractive and repulsive forces between molecules. Hydrogen bonds are stronger than van der Waal's forces of attraction and weaker than covalent bond.

Ionic bond \(\,>\,\) covalent bond \(\,>\,\) hydrogen bond \(\,>\,\) van der Waal's forces.