Solution
Option 1 -> The passage shows Charlotte's cheerfulness without suggesting Elizabeth believes it's a facade hiding regret.
Option 2 -> There's no indication that Elizabeth views Charlotte's happiness as performative or done to impress visitors.
Option 3 -> Elizabeth observes Mr. Collins' ostentatious formality and formal civility, then "wondered how her friend could have so cheerful an air with such a companion"—indicating her struggle to understand Charlotte's contentment given Mr. Collins' personality.
Option 4 -> While Charlotte may have practical views on marriage, the passage doesn't suggest Elizabeth assumes this about her expectations.
Hence, Option 3 -> Elizabeth cannot understand how Charlotte maintains such genuine cheerfulness while being married to someone with Mr. Collins' pompous and formal personality traits. The phrase "wondered how her friend could have so cheerful an air with such a companion" directly expresses Elizabeth's difficulty in reconciling Charlotte's contentment with the reality of Mr. Collins' character -> correct