The correct option is C supernormal profit
Supernormal profit is a profit which is more than that of the normal profit. A monopoly is a situation where there is only a single seller who sells products which are not close substitutes for each other. There is also a free entry and exit of firms. The owner also has a full control over the prices of the product. Hence, a seller can earn huge profits due to price discrimination. Hence, the magnitude of monopoly power is based on supernormal profit.