If Two Accountants Have Had the Same Education, Amount of Experience

If two accountants have had the same education, amount of experience, and work at the same type of job for the same profit-maximizing firm, which charges its clients a uniform hourly fee,

A) they should earn the same amount of money
B) the one whose job is riskier should be paid more
C) the one whose job is riskier should be paid less
D) the one who has a higher marginal product (due to ability) should be paid more
E) the one who has a higher marginal product (due to ability) should be paid less