If Ewan is consuming his utility maximizing bundle and the price of one good falls, what happens to the marginal utility per dollar spent on this good (MU/P), and what should Ewan do?

A) MU/P has increased and Ewan should buy more of this good.
B) MU/P has decreased and Ewan should buy more of this good.
C) MU/P has increased and Ewan should buy less of this good.
D) MU/P has decreased and Ewan should buy less of this good.

A