She is supporting an inference from the text. An inference is something that is implied, and the person saying they've "witnessed much fighting" infers that they're old, whereas "I am wounded with iron" can be taken to mean he's been wounded by a weapon like a sword.
Answer: I think it’s A :’)
You didn't provide us with the text.
Twain accomplishes his purpose chiefly through telling a story within a story, also called a "frame story".
He wants to change the misconception that most slaves sing their lungs out because they feel happy.
