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(C) is the only option looks fine. Although, IMO, the new woman PM was elected only recently (in the 21st century) and the author is trying to compare the current situation of women with that of the last century (the 20th century). Therefore, any option which would read as "..has changed little (in comparison with the situation in the last century).. " should be fine. However, in the absence of such an option, I'd go with (C).
Check out this awesome article about Anderson on Poets Quants, http://poetsandquants.com/2015/01/02/uclas-anderson-school-morphs-into-a-friendly-tech-hub/ . Anderson is a great place! Sorry for the lack of updates recently. I...