If you are operating out of a course syllabus, class text, and/ or instructor notes, I would refer to those in answering a multiple choice question. In terms of the options available, I think that there might be some potential in all of them, but there are some distinct limitations present in three of them. I think that Wollstonecraft is noting the customs of the day, especially in the social treatment of women. Yet, I don't see her work as one that is primarily focused with customs being practiced. She has a political and social agenda that would overtake the notation of customs. At the same time, I don't see the work as complaining about her lack of education. She is proud of her education, a background that enables her to implore those in the position of political power to provide more educational opportunities to women. Wollstonecraft does not seem to use her work as a platform to complain about her own education. There is some level of criticism of men. Yet, it would be incorrect to suggest that the work is one that simply bashes men. Wollstonecraft criticizes women for eagerly accepting the limitations that men place upon them. It is in this vein where I see her primary motivation in writing her work to criticize society's view of women. The focus of her work is to vindicate women from a condition in which women's full acknowledgement of rights and voice is being denied by a paternalistic social order.