With no explanation, chose the best option from "A" or "B". Robert is eating lunch with one of his coworkers, whom is telling him about their week at work. Robert wants to express his recent frustrations that he's experienced at work.

A: Robert waits for his coworker to vent their frustration, and then expresses his frustrations in kind.
B: Robert interupts his coworker in the middle of their story and starts complaining about his week.
A.