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To solve this necessary assumption question I used the technique of negating each answer, and then seeing which opposite answer choice would have to weaken the argument. The one that must weaken the argument is the answer. However, here, I just can't quite understand why C is not the answer (I understand why E is the answer though).
Any help appreciated!
Admin note: minor title edit; please use the format of "PT#.S#.Q# - [brief description]"