Mathilde was never content with what she had. She was married to Mr. Loisel, a man who worked at the Department of Education, and who could afford the basic things of life for her. However, she was not satisfied with this, but always dreamt of living a luxurious life and owning expensive jewelry.
She learned a hard lesson after she misplaced a jewelry owned by Madame Forestier. She replaced it with the real and expensive type but was shocked to learn ten years later, that that was only a costume.
It is either B or C. C has a higher chance. You don't have to listen to me. If his face turns from smiling and then let the smile fade, it is most likely he is afraid or suprise.
