Read the excerpt from act iii of the importance of being earnest.

lady bracknell. [with a shiver, crossing to the sofa and sitting down.] i do not know whether there is anything peculiarly exciting in the air of this particular part of hertfordshire, but the number of engagements that go on seems to me considerably above the proper average that statistics have laid down for our guidance. i think some preliminary inquiry on my part would not be out of place. mr. worthing, is miss cardew at all connected with any of the larger railway stations in london? i merely desire information. until yesterday i had no idea that there were any families or persons whose origin was a terminus. [jack looks perfectly furious, but restrains himself.]

how can lady bracknell asking miss cardew (cecily) if she is "at all connected with any of the larger railway stations in london” be seen as a reflection of victorian social codes?

knowing that jack was found as a baby in a railway station, she is excited that cecily may also be connected to a railway family because it suggests wealth.
since she already knows about jack’s background, she is angry that algernon may marry someone who is not as educated as he is.
knowing that jack was found as a baby in a railway station, she is concerned that algernon wants to marry someone who may be of a lower social ranking.
since she already knows about jack’s background, she is curious to know about cecily’s because it is considered mannerly to show interest in others.