Firefighters Are Generally Paid Higher Wages Than Those with Comparable

Firefighters are generally paid higher wages than those with comparable skills because:

A) firefighting is dangerous work.
B) firefighters work more hours each month than do workers in most other professions.
C) firefighters value leisure less than the average person does.
D) firefighters, on average, spend more years receiving training than individuals in other professions.
E) firefighters need to travel long distances to complete their tasks.