You Tell a Vulgar Joke to Your Co-Worker

You tell a vulgar joke to your co-worker. She becomes offended and files a complaint with her supervisor. Where did you go wrong?

A) You assumed similarity between you and your co-worker.
B) You chose to tell a joke that wasn't funny.
C) You made a snap judgment about your co-worker.
D) You mistook your co-worker's presenting self for her perceived self.