Al Hires Bob to Move His Furniture to His New

Al hires Bob to move his furniture to his new house.On the day of the move,Bob does not feel like moving furniture,so he asks his friend Chuck to move the furniture.Chuck decides to leave before completing the move in order to watch a football game on TV.Al has to delay his move and hire another mover at a higher price.Al wants to sue Bob to recover for his damages.Given these facts,Al will most likely:

A) lose,because it was Chuck,not Bob,who failed to fulfill his duty to Al.
B) win,because Bob's duty to Al was not delegable.
C) win,because Bob is liable to Al.
D) lose,because he failed to insist on Bob's performance.