George and Susan Work at the Same Brewery

George and Susan work at the same brewery. George works in advertising. Susan works as a forewoman in the bottling plant. George is paid more than Susan.

A) Because the male worker earns a higher salary than the female worker, the employer must be discriminating against women.
B) If George has better performance reviews than Susan, the company might be rewarding George for his high productivity.
C) If forepersons at bottling plants typically earn more than employees in the advertising department, then the brewery must be discriminating against women.
D) George might be earning more because he works the day shift while Susan works the night shift.