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. This fact is likely to cause further investigation in a pay equity program implementation under which of the following circumstances?

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