Green Grass Hospital Pays Its Hallway Painters/technicians Nearly Twice the Hourly

Green Grass Hospital pays its hallway painters/technicians nearly twice the hourly rate that it pays the nurses.Under which of the following circumstances is this fact likely to cause further investigation in a pay equity program implementation?

A) if the nurses have more seniority
B) if the painters have more training
C) if the nurses are predominantly women and the painters are predominantly men
D) if the painters' union becomes involved in the process