When purchasing a new wardrobe, Ronald expects a fair exchange between himself and the retailer, where the price he pays for a product or service matches the value he receives. This theory helps him understand his satisfaction or dissatisfaction based on perceived fairness in the exchange. Which of the following is a theory about the fairness of exchanges between individuals, which helps in understanding consumer satisfaction and dissatisfaction?

A$.$ none of these

B$.$ Social Learning Theory

C$.$ Schematic Theory

D$.$ Conflict Theory

E$.$ Equity Theory