I think it would be simple since it only has one subject (it) and one predicate (is).
<u>The correct answer is: It demonstrates that Nora is considering leaving her children.</u> Nora reveals to the nurse that she fears that her children will forget her if she leaves definitively. Nora believes that her secret will be revealed and she will be expelled from her home, her family and society. Nora did not have to worry about taking care of the children because she had the help of the nurse and more servants.
Your answer would be, The primary purpose of " Let Sleeping Dogs Lie"., is to Narrate a personal story that criticizes the draft board.
Hope that helps!!!