The correct answer is A) The student is defending the author's claim.
The approach that the student is taking in the argument essay is that the student is defending the author's claim.
This is correct in that in the student's argumentation, he writes: "Obviously, this has occurred. One need look no further than the cable network channel guide to find numerous networks devoted only to political updates,..."
When the student writes the words "Obviously, this has occurred," he is confirming the author's claim that the cable TV has allowed spreading political ideas massively in the news and through special programs. According to the student arguments, these facts have provided the audience with many and proper political content that has increased the interest of the American citizens in politics.