The government taking away every gun from every single owner is an unrealistic answer. The government can have a buyback program to get rid of guns, but cannot force to take away millions of guns.
I think it is A) Reference
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.
