What part of Gregor's life before his transformation leads you to believe that Gregor was not very happy?

A. Gregor's boss fired Gregor because he stole money from the company.
B. Gregor had no friends because he was obnoxious.
C. Gregor's sister stole money from him, forcing him to work longer hours.
D. Gregor's parents were unappreciative and not very kind to him.