Channing had been working for the lumber company for six years. He had taken extra shifts, arrived early, and trained new employees. Now that the position of assistant manager was opening up, he hoped all of his dedication and hard work was worth it.

What is the central idea of this paragraph?

A. Being an assistant manager requires Channing to take on additional responsibilities.
B. Channing is hoping all of his years of service will result in a promotion.
C. The best employees know that it's important to accept additional shifts.
D. Working at a lumber company often means working longer hours than expected.