Which of the Following Statements About Price Discrimination Is Correct

Which of the following statements about price discrimination is correct?

A) Price discrimination is always more profitable than charging a single price.
B) A price discriminator would want to charge the highest price to those customers with the most elastic demand for his product.
C) To be successful, a price discriminator must assure that items can be resold between high- and low-price groups.
D) To maximize profit, a price discriminator distinguishes groups with different demands and charges higher prices to those with the more inelastic demand.