I believe that It is C, because although the passage does focus on Mathilde's love for expensive things, broadly the subject is how Mathilde is discontent with the lifestyle she is now living, and D is too broad, and B is also too broad.
Answer: 1. She 2. me 3. she 4. I 5. her 6. he 7. She 8. They
Explanation: Hope this helps! :)
A prepositional phrase consists of the preposition and its complement. From the given sentences above, the sentence in which the prepositional phrase best modifies the verb saw is option C. Through the window, I saw the bird flying. The prepositional phrase in this sentence is "through the window".