Andy views beer and pizza as complements to one another. If the price of pizza decreases, economists would expect:

Andy's demand of beer would increase

Explanation:

Complementary goods are goods that are consumed together e.g. bread and jam

If the price of a good increases, the demand of the complementary  good decreases and if the price of a good decreases, the demand for the complementary good increases

The decrease in the price of pizza would increase the quantity demanded of pizza and increase the demand for beer

answer; i believe that the correct answer is (an elevator pitch);