It should be the ProctorU portal. Good luck!

Would the fact that the question asks for the "argument" also contribute to C being wrong because C is describing the context/background and not the argument itself?

#help (Added by Admin)

Thanks guys this is really cool. One thing I noticed that was broken for my account (I don't know if this is just mine or everyone's) is that the answer button on the single walk through questions don't work anymore - as in the bar that drops down and tells you how difficult the question was and what score range tended to get the question right.