Answer: a) The narrator longs to be unnoticed in public.
In this excerpt, the author describes the steps she took in order to change her appearance. It is implied that these changes are meant to help her go unnoticed as she calls them a "disguise" (which has the implication of hiding your real appearance). Moreover, she claims that the white people "would never, never recognize me," which supports the idea of the author wanting to be unnoticed.