The answer is D) Cooper focused on the themes of the frontier that were prominent in American culture. I took the test and got this one right.
Voice in a text is practically point of view. So, the point of view from a certain character in a text is the text's voice, or the perspective that the author wants to present us with.
I believe the best example of manipulating an audience through media is letter B.
I would say the answer is D if not i'm sorry