100 PTS! Brainiest to correct answer.

In A Streetcar Named Desire, when is the audience first aware that Stella and
Stanley come from different backgrounds?

A. When Stanley tells Mitch about Blanche's past.
B. When Stanley goes through Blanche's trunk.
C. When Stanley gets drunk at the poker party.
D. When Stella tries to describe Stanley to Blanche when she first
arrives.
E. None of the these.

Please only answer this question if you know the answer and read the story. If you don't know, don't answer the question solely for points are you will be reported.