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Q4. I agree with the OA here. The main purpose of Robertson's work is stated in the first paragraph: "British colonialism imposed European-style male-dominant notions upon more egalitarian local situations to the detriment of women generally". Her research also considers that specific point, whether or not the Empire imposed its own set of values on African society.

Q5. Again, I agree with the OA. Women in Ghana were more independent as compared to women in other African countries (see Kenya), so colonialism affected their lives the most, since they went from independent to legal minors.
E is incorrect, IMHO, because you have this phrase here: "In contrast with Ghana, where women had traded for hundreds of years and achieved legal majority (not unrelated phenomena), the evidence regarding central Kenya indicated that women were legal minors". You have that "contrast" right there that proves that E is incorrect.

Q6. I don't know about this one. IMHO it should be C, because that's what the passage does: compare one situation (Ghana) to another (Kenya). It is of course part of the argument about Robertson's revised attitude, but that's much more of a general thing, or macro level if you must... I wouldn't expect to see such an ambiguous question in the GMAT.