求助OG12-77

The author of the passage mentions the supervision of
schools primarily in order to
(A) remind readers of the role education played in
the cultural changes of the nineteenth century in
the United States
(B) suggest an area in which nineteenth-century
American women were relatively free to exercise
power
(C) provide an example of an occupation for which
accurate data about women’s participation are
diffi cult to obtain
(D) speculate about which occupations were
considered suitable for United States women of
the nineteenth century
(E) illustrate how the answers to questions about
women’s status depend on particular contexts

答案是E, 通过排除前面的选项得到的，但觉得理解得还不充分。NN能帮忙解释下如下定位部分的意思吗？

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.