repitition I think but I need the choices to confirm.
They can help strengthen a point as long as the question is then enforced. They help to convince the listener since usually even thought it's not said we usually think yes in our head after hearing a rhetorical question.
Answer: I don't know of the book you read, but..
Authors use historical times and revise them in such a way it's believable, immersive, and informative. They make sure their use of history isn't changed into an outlandish fashion to fit the time it's set in. They usually do this because you can't go back in history and show them what happened, so you must create a fictional yet historical piece to preserve the time.
The meaning of Gwendolen's words is that she is against the traditional idea that women are the ones who should stay at home to be in charge of the domestic duties. She shows that women might have a position of power and that men can stay at home.
The literary technique used is Paradox because Gwendolen proposes a reversal of the traditional and well-known ideas.