The Figure Below Shows the Demand Schedule and Demand Curve

The figure below shows the demand schedule and demand curve for a product produced by a single-price monopolist. FIGURE 10-1
-Refer to Figure 10-1.Suppose this single-price monopolist is initially selling 5 units at $8 each and then reduces the price of the product to $6.By making this change,the firm is giving up revenue of ________ on the original number of units sold and gaining revenue of ________ on the additional units sold.Its marginal revenue is therefore ________.(All figures are dollars.)

A) 38; 40; 2
B) 8; 6; 2
C) 10; 12; 2
D) 14; 14; 0
E) 5; 7; -2