The correct answer is: Instrumental orientation
Rationale: An instrumental orientation accounts for why some people take jobs offering high monetary rewards rather than intrinsic interest or job satisfaction (up to a certain point).
Job enrichment is a form of job design which more or less assumes the opposite: that people seek intrinsic satisfactions in work itself.
Performance-related pay is an approach to motivation based on the assumption (not always accurate) that workers have an instrumental orientation to work.
Theory Y is irrelevant, relating to McGregor's Theory X and Theory Y.
Pitfalls: Be ready to think through questions that address more than one area of the syllabus.