Adam and Bob Are Identical Twins Who Attended Grammar School

Multiple Choice

Adam and Bob are identical twins who attended grammar school through high school together. Adam got a job after high school, and Bob got a job after graduating from college. Adam earns $36,000 a year, and Bob earns $69,000 a year. Select the best explanation for this wage difference.

A) Adam has less human capital than Bob.
B) Bob has less human capital than Adam.
C) Adam has received a compensating differential
D) Adam is a member of a union.