The diagram below accompanies this question illustrates curves for a firm operating in a differentiated product oligopoly. One of the demand curves is relevant when rivals match the firm's price changes; the other demand curve is relevant when rivals do not match the price changes Which answer is most relevant when rivals do not match Any price changes A) Margjnal cost B) demand B and MR-B C) DEMAND A and MR-A D) Demand A and MR-B