Goods X and Y Are Defined to Be Substitutes in Consumption

Multiple Choice

Goods X and Y are defined to be substitutes in consumption if

A) the supply of Y varies inversely with the price of X.
B) the two goods are virtually the same.
C) the supply of Y varies directly with the price of X.
D) the demand for Y varies directly with the price of X.
E) the demand for Y varies inversely with the price of X.