Which of the following is one of the three defenses provided for a seller charged with price discrimination?
a. A seller can legally vary price if the products sold are commodities or other tangible goods.
b. A variation in price is justified if designed to meet fluid product or market conditions.
c. A buyer can legally use his or her purchasing power to make sellers sell their products at discriminatory prices.
d. A price discrimination is allowed if the products sold are of like grade and quality.
Answer: b.