In "their eyes were Watching God", Hurston who is trying to recognize that folk culture which is represented in the identification of black characters. Their identification is portrayed with "front-porch culture" the same case applies to their language. They go together hand in hand, as the way font porch represents the community and its life.
The language is different from white American, that is why it places the black's identification apart. Hurston alternates between Black English as well as sophisticated speech. The picture that Jane has two identities is enhanced. Since she is part of white, she had a good education, lived a good life, has a straight hair and she is capable of speaking of being sophisticated.
She relies on her dialect of Black English so as to identify with other black people who are in her community.
The last sentence is one, but almost the entire excerpt speak of fighting and winning to get that ideal political situation. This excerpt is all about the freedom from fear. That sounds like a call to arms, an encouragement to overcome fear and fight. The sentences leading to the last talks about how maintaining freedom involves fighting for it, and that the only way to stop the struggle (for human rights) is to win that fight.
I believe that the best answer among the choices provided by the question is
<span>D. Henry James and Sarah Orne Jewett</span>
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