Dr Benson Is Regarded As, by Far, the Best Dentist

Dr. Benson is regarded as, by far, the best dentist in his part of the country, yet his income is not significantly higher than the average income for a dentist in his area. In contrast, Bo Johnson, the best baseball player in that region, earns five times the average salary of all baseball players. The most likely explanation is that

A) the widespread perception that Dr.Benson is a great dentist is, in fact, incorrect.
B) the baseball players' union is more powerful than the professional association of dentists.
C) Bo Johnson, unlike Dr.Benson, can provide his services to millions of people simultaneously.
D) chance plays a role in determining people's incomes, resulting in earnings discrepancies that are hard to explain or justify.