Suppose David spends his income on two goods, x and y, whose market prices are p_(x) and p_(y), respectively. His preferences are represented by the utility function U(y) = (M)U(y) = (M)U(y). How are his preferences represented?
A) By the utility function U(y) = (M)U(y)
B) By the utility function U(x) = (M)U(x)
C) By the utility function U(x) = (M)U(y)
D) By the utility function U(y) = (M)U(x)