Assume that this law holds for Quincy with ice cream and pretzels.
Quincy decides to eat less ice cream and more pretzels. As a result?
A. Quincy's marginal utility of ice cream decreases, and his marginal utility of pretzels increases.
B. Quincy's marginal utility of both ice cream and pretzels decreases.
C. Quincy's marginal utility of both ice cream and pretzels increases.
D. Quincy's marginal utility of ice cream increases, and his marginal utility of pretzels decreases.