Phil Harrison Is a Welder Who Works on Skyscrapers and Extension

Multiple Choice

Phil Harrison is a welder who works on skyscrapers and extension bridges.Phil's brother William is also a welder but he works in a manufacturing plant where he does all of his welding on ground level.Which of the following would not explain why Phil earns a higher wage than his brother?

A) cognitive dissonance
B) Phil has greater experience as a welder than his brother has.
C) Phil's marginal revenue product is greater than William's marginal revenue product.
D) Phil's job is more hazardous than William's job.