Assuming That Peanut Butter and Jam Are Complementary Goods, an Increase

Assuming that peanut butter and jam are complementary goods, an increase in the price of peanut butter will cause:

A) a decrease in the demand for peanut butter.
B) a decrease in the demand for jam.
C) an increase in the demand for jam.
D) no change in the demand for jam but a decrease in the quantity demanded of peanut butter.