Mary Jane Applied for One of Two Openings for an Executive

Mary Jane applied for one of two openings for an executive secretary position at QRP,Inc.The job posting showed a starting salary range of $70,000 to $80,000 depending on skills,education,and experience.The job called for a minimum of five years of experience,a bachelor's degree in business,accounting,or communications,the ability to use a wide variety of office equipment,and the ability to use the entire Microsoft Office Suite.She was employed in this exact same job for a different company for seven years,she had an MBA,and taught the entire Microsoft Office Suite at a college in addition to using it on the job.She used Publisher to create the company newsletter.Austin applied for the same job as Mary Jane.He had a bachelor's degree in accounting,five years of experience as an administrative assistant,used the entire Microsoft Office Suite on the job but never taught it and did not create a company newsletter.The company hired Mary Jane at $72,000 per year and Austin at $77,000.Mary Jane was outraged when she discovered the discrepancy in their pay.Which of the following theories addresses the reasons for Mary Jane's reaction?

A) Theory Z
B) Theory X
C) Reinforcement theory
D) Equity theory