What is Mathilde most likely thinking and feeling when she hears Madame Forestier's confession?

A. She probably wants Madame Forestier to reimburse her for the cost.
B. She probably is heartsick at the thought of how much she has suffered unnecessarily.
C. She probably is relieved that the necklace she lost wasn't all that valuable.
D. She probably thinks she has been cheated out of the social class status she deserved.