________ Is a Defense in a Section 2(a)action Which Provides

Multiple Choice

________ is a defense in a Section 2(a) action which provides that a seller's price discrimination is not unlawful if the price differential is due to "differences in the cost of manufacture, sale, or delivery" of the product.

A) Natural monopoly defense
B) Meeting the competition defense
C) Changing conditions defense
D) Cost justification defense