GMAT Reading Comprehension (RC) | Re: The professionalization of the study of history in the second half of

Hi,

Lines from the pasasge:
On the one hand, in writing about women, earlier historians had relied not on firsthand sources but rather on secondary sources.

In passage these lines tell about earlier historians whereas this line from passage suggeststhe shift to more rigorous research methods required that secondary sources be disregarded the view of current historian. Irony is about current historians not old , therefore B
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