Consider a Two-Good World,with Commodities X and Y

Multiple Choice

Consider a two-good world,with commodities X and Y.Which of the following statements is correct?

A) Both X and Y must be normal goods.
B) If good X is a normal good, good Y must be an inferior good.
C) If good X is an inferior good, good Y must be a normal good.
D) Both good X and good Y can be inferior goods.