The author most uses the following two techniques to advance their purpose:
A. point of view - The passage expresses a clear perspective on the representation of female superheroes and the need for more narrative focus on them.
D. description - The author describes the current state of female superheroes, their outfits, and the issues surrounding their representation, which helps to illustrate the need for more attention to their stories and character development.
So, the correct answers are A. point of view and D. description.