(I) Differences in Worker Productivity Are One Major Reason Why

Multiple Choice

(I) Differences in worker productivity are one major reason why individual earnings differ. (II) Even if all workers were identical, differences in the desirability of jobs would still cause earnings differentials.

A) Both I and II are true.
B) I is true; II is false.
C) I is false; II is true.
D) Both I and II are false.