Answer:
b) The pay difference is unlawful, unless Midwest can establish some significant difference between Zone A and Zone B.
Step-by-step explanation:
The equal Pay Act of 1963 states that men and women should earn the same salary for similar jobs, i.e. there should be no distinction of gender when establishing a person's salary.
The exception to this rule would be that the work carried out in Zone A is much more demanding, challenging, difficult, important or relevant than the work carried out in Zone B. E.g. Zone A represents 75% of total revenue, or includes very large cities.