I don't think I'm qualified to give a grade, but for question 4 it is of utmost importance that you offer a diverging view/opposite side to the argument. The question is posed as a debatable statement and they want you to argue for and against it; I don't believe you can access the higher marks without including an alternative view. I'd suggest doing alternating paragraphs to show a structured argument. This is not the case for any other questions, that's why the question is a 20 marker.