Why is Mathilde dismayed when her husband shows her the invitation to the ball at the palace of the Ministry in "The Necklace"?

A.) She thinks the people who will be at the ball will be unfriendly to her.
B.) She has nothing appropriate to wear to the formal ball.
C.) She thinks the people who will attend are beneath her class.
D.) She becomes nervous and anxious when she is in large crowds.

I'm not very good at ELA T-T