Hello there.
I think you are missing the options, but I have found, on internet, the following ones:
A. Emily wingspaninson
B. Sarah Orne Jewett
C. Mark Twain
D. Ambrose Bierce
E. Kate Chopin
F. Charles Waddell Chesnutt
If those are the options, then the correct one to your question is C: Mark Twain. He is the writer of Huckleberry Finn, book whose main character is Huck Finn. In addition, he is also known for using realistic dialect in his works.
Hope this helps!