A Manufacturer Could Try to Defend Itself Against Charges of Price

A manufacturer could try to defend itself against charges of price discrimination under the Robinson-Patman Act by claiming that:

A) the products were not of "like grade and quality."
B) any price differences were to "meet competition in good faith."
C) the price differences did not injure competition.
D) the price differences were justified on the basis of cost differences.
E) All of the above are possible defenses against price discrimination charges.