Final answer:
The quotation that best reflects Mathilde's attitude change is c) "I never thought it could be this bad."
Step-by-step explanation:
The quotation that best reflects Mathilde's attitude change is c) "I never thought it could be this bad." This quotation suggests that Mathilde's attitude has shifted from being optimistic to being pessimistic. She no longer believes that life is wonderful and filled with surprises, but instead sees it as something negative.