Every Day for the Past Two Years You've Had Ham

Multiple Choice

Every day for the past two years you've had ham and cheese on a whole wheat bagel for lunch at Bungalow Bob's Bagel Boutique.However, the price of whole wheat bagels has risen by 10 cents so today you decide to have ham and cheese on a rye bagel.In this case, whole wheat and rye bagels are best considered:

A) superior goods.
B) normal goods.
C) substitute goods.
D) complementary goods.