George Earns $500,000 Playing Baseball for Team X

George earns $500,000 playing baseball for team X. His next best alternative to playing baseball is to own a fast-food restaurant, for which he would earn $100,000 a year. His next best alternative to playing baseball for team X is playing baseball for team Y, for which he would earn $400,000 a year. This example best illustrates the economic principle that

A) economic rent is never zero.
B) baseball players earn higher incomes than fast-food restaurateurs.
C) economic rent exists in all situations.
D) economic rent differs depending upon the perspective from which the factor is viewed.