Consider the following su pplyanddemand diagrams depicting the markets for X and Y. respectively. In the market for good X, supply is perfectly elastic, indicating that producers are prepared to supply any amount of X at price p0. Price of X Quantity of X Quantity of '1' a. In the market for X. demand increases from Du. to D1. As a resultI the total value that consumers place on X increases b. The increase in demand for X does not change' marginal value that consumers place on X. c. In the market for Y. a technological improvement causes supply to increase from 5c to 51, causing price to fall from Pu to p1. The total value that consumers place on a given quantity of Y consumed is unchanged . d. The marginal value at Y C) A. is unchanged since demand did not shift. (9 B. falls because the price fell. even though there has been no change in their preferences regarding Y. C) C. falls since the price fellI indicating a change in their preferences regarding Y. C) D. is unchanged even though the price tell, since there has been no change in their prelerences regarding Y