Answer: Option (a) is the correct answer.
Step-by-step explanation:
Intermolecular interaction means the interactions present between two molecules. And, intramolecular interactions mean the interactions present within the molecules of a substance.
So, when interactions within a molecule that is, intramolecular interactions change then chemical properties of the substance changes.
On the other hand, when intermolecular interactions change then there occurs change in state of substance.
Thus, we can conclude that intermolecular interactions are broken when a liquid is converted to a gas.