Rational Choice (revenge) is the correct answer.
A motive is the reason why a person decides to commit a crime, such as: rational choice, passion, environment, mental illness, and drug addiction. Rational Choice is made up of a variety reasons, including greed, need, revenge, lust, anger, jealousy, vanity and thrill-seeking. In this case, Bob Walker's motive to commit the crime was rational choice since he wanted to get back at the store for demoting him from a management position.