Option 1 -> While he does display his home to her, Elizabeth perceives a specific motive beyond simple impression.
Option 2 -> Elizabeth "fancied that in displaying the good proportion of the room, its aspect and its furniture, he addressed himself particularly to her, as if wishing to make her feel what she had lost in refusing him" - clearly a reproach for her rejection.
Option 3 -> The passage focuses on making Elizabeth regret her own decision to refuse him, not on making her envious of Charlotte specifically.
Option 4 -> His behavior shows no gratitude; rather, it's calculated to make Elizabeth reconsider her past refusal.
Hence, Option 2 -> Elizabeth perceives Mr. Collins' ostentatious display of his home and its features as his way of making her feel regret for refusing his marriage proposal, essentially reproaching her for the decision by showing her "what she had lost" -> correct