The play is set in a time period when society was defined by strict gender roles. In this story, we are discussing a married couple at this point. She does not want her husband to feel like he does anything to her. This alone implies gender roles, and the separation in the rolls e this alone implies gender roles, and the separation in the roles.
So if you think about the connotations of the words, veils conceal things, sifting implies a kind of search, so I'd say the answer is C. a ghostly, mysterious mood.
