C)to highlight the fact that the speaker is no different from any other average American girl
Explanation:
Although the speaker is descendant of Japanese people and she most likely looks like one, this is nothing but facial features and far resemblance. In her core, Okita is just another american girl who dresses, talks, eats, and thinks like any other american girl who happens to be descendant of Japanese people a lot like other Americans are descendants of people from other countries such as Britain, Germany, Scotland, and so on.
