Consider a Consumer Who Divides His Income Between Spending on Good

Consider a consumer who divides his income between spending on good X and good Y. The opportunity cost of good X in terms of good Y is reflected by the

A) price of good X relative to the prices of all other goods.
B) ratio of the price of X to the price of Y.
C) absolute price of good X.
D) ratio of the price of Y to the price of X.
E) absolute price of good Y.