Answer:
Her family is wealthy while the story focuses on impoverished people.
Step-by-step explanation:
Guy de Maupassant's short story "The Necklace," tells the story of a young married woman named Mathilde and her desire to be among the rich and higher class in society. And this greed and desire led them to an unfortunate turn of events that led to their downfall.
A flat character is someone who doesn't change much throughout the story. Moreover, the character is not developed or talked about or included in the story but exists more as a supporting character. And in this short story, Madame Forestier is the rich friend who lends Mathilde the necklace. The only thing important about her character is that she is rich and helps secure the necklace while the story focuses on Mathilde, the poorer woman.
Thus, the correct answer is the fourth option.