Which of the Following Examples of a Wage Disparity Is

Which of the following examples of a wage disparity is an example of compensating differentials?

A) Tiger Woods gets paid more than a college professor.
B) A window washer working in a suburban residential subdivision gets paid less than one who is washing windows on the outside of a skyscraper.
C) A nuclear scientist gets paid more than a janitor working in the same building.
D) On average, white men get paid more than women of all ethnicities.