The correct option is D Lebsock has demonstrated the importance of frame of reference in answering questions about women's status.
"More importantly, she shows that the debate itself depends on frame of reference: in many respects, women lost power in relation to men, for example, as certain jobs (delivering babies, supervising schools) were taken over by men. Yet women also gained power in comparison with their previous status, owning a higher proportion of real estate for example" - this extract from the passage, specifically the use of 'more importantly', lends support to option B as being the correct answer. The other choices do not fit the context as well.