Exhibit 6-3 Marginal Utility Data for Goods X and Y

Multiple Choice

Exhibit 6-3 Marginal utility data for goods X and Y $$\begin{array} { | c | c | c | c | } \hline \text { Units of good X } & \begin{array} { c } \text { Marginal utility of } \\\text { good X }\end{array} & \text { Units of good Y } & \begin{array} { c } \text { Marginal utility of } \\\operatorname { good~Y }\end{array} \\\hline 1 & 20 & 1 & 14 \\2 & 16 & 2 & 12 \\3 & 12 & 3 & 10 \\4 & 8 & 4 & 8 \\5 & 4 & 5 & 6 \\\hline\end{array}$$
-According to the utility model of consumer demand, the demand curve is downward-sloping because of the law of:

A) diminishing marginal utility.
B) diminishing consumer equilibrium.
C) consumer equilibrium.
D) diminishing utility maximization.