Explanation:

Option (b) is correct: Price discrimination is a pricing strategy that charges consumers different prices for the same product or service. The seller charges each customer the maximum price he or she will pay In more common forms of price discrimination, the seller places customers in groups based on certain attributes and charges each group a different price For ex: Consumers buying airline tickets several months in advance typically pay less than consumers purchasing at the last minute. When demand for a particular flight is high, airlines raise ticket prices. In contrast, when tickets for a flight are not selling well, the airline reduces the cost of available tickets. Same is with banks charging more interest based on difficulty of the consumers.