I think the answer is c ,I am not sure but for me that looks like the best answer of how she gets to trust him
I believe the answer is D.
The guest are happy that they are able to wall off themselves from the world containing the Red Death. They planned to live and dance in luxury until disease died out. The only thing halting their excitement was the ominous clock chimes where all would stop until it ended.
Why does biff steal?
Biff steals things because it is his passive-aggressive way of getting back at people he feels have unfairly done better in life than he has,
What compels him to steal?
stealing gives him an excuse to quit whatever dead-end job he happens to be in at the moment.
Future?
This pattern of subtle revenge and avoiding of mundane responsibility is exposed to be a nearly life-long pattern for Biff, and one that will continue.