The owner of a pizza shop observes that when she raises the price of a large pizza, her total revenue decreases, and when she lowers the price of a large pizza, her total revenue increases. This suggests that:

A.pizza lovers act irrationally.

B.the demand for her large pizzas is elastic with respect to price.

C.the demand for her large pizzas is inelastic with respect to price.

D.there are few good substitutes for a large pizza.

正确答案：the demand for her large pizzas is elastic with respect to price.