You can eliminate C because that is a Flat Character.
The answer is A from what I see.
<span>The use of 1.____ in the excerpt above helps accomplish the Twain’s objective to capture the essence of people from different regions. He uses this technique to make the story more 2.___ , which is one of the main characteristics of 3.____ literature.
1. dialects
2. credible
3. realist</span>
I'm not sure but i think you put the answer in your question.
Both A and C
