The correct answer is: [A]: "<span>a beige one" .
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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.
Its to persuade and encourage tourists to visit, sight-see, and do some activities and to also spend money in the state.