Question

Suppose that Erin spends all of her income on two goods: pizza and fiction novels. If the price of pizza rises, then
A. The current marginal utility per dollar spent on pizza will rise
B. The current marginal utility per dollar spent on pizza will fall
C. The current marginal utility per dollar spent on fiction novels will rise
D. The current marginal utility per dollar spent on fiction novels will fall

The answer is B?
yes, but am not sure

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