With no explanation, chose the best option from "A" or "B". Bob is at the office trying to get some work done but his coworker keeps asking him questions. Bob wants to not answer any more of his coworkers questions.

A: Bob doesn't respond to his coworker's questions and just stares ahead and continues working as if he can't hear them.
B: Bob tells his coworker that he can't answer any questions because he has to do some work, so they leave him alone.
B.