b. The narrator reflects the Southern environment when she uses the phrase "walked on off," an example of nonstandard English.
Explanation:
The fact that you mention Tea Cake means that you are likely referring to the novel <em>Their Eyes Were Watching God</em>, by Zora Neale Hurston. This novel is set in the south during the early 20th century, and the way in which it is written reflects this. The narrator in the text reflects the Southern environment the novel is set in. Moreover, the narrator employs the nonstandard English that was common among the African American people of the area.
