During the process of cooking rice, salt is added before adding rice to the pot of water. Which among the following can be the reason to do so ?

The correct option is B To increase the boiling point of water.
Here salt is an impurity that is being added to the pot of water. Addition of impurities to a solution increases its boiling point. It requires more heat to be supplied to break the additional intermolecular attractions in the solution due to the addition of impurities. In this case, when the boiling point of water increases, it facilitates better cooking of the rice.