Answer:
The necklace Mathilde borrowed from Madame Forestier was made of paste.
Explanation:
To find the answer, we'll cross out some options.
- The first option can't be right because there is no textual evidence that Madame Forestier thinks the necklace is fake.
- The second option is definitely not an answer because she never looked down on her.
- The third option is wrong because Mathilde always new she was rich and never thought she was poor.
The last option is the best answer and makes the most sense. Hope I helped!