The Proven Success of Job Specialization Lies in the Fact

The proven success of job specialization lies in the fact that

A) it leads to groupthink.
B) it avoids the pitfalls of division of labor, where workers become removed from thinking conceptually about the business.
C) it is a detractor to others who are thinking about entering your industry because it successfully creates barriers to entry.
D) it adds efficiency to the business's operation by identifying tasks that some do better than others.