I absolutely love this feature. It motivates me so much when it tells me that I will get a certain percentage wrong, and then I actually do! Ahhh!
One thing, though, is that I wish we can choose to restrict newer PT questions. This would be much desired
Other than that, I think it is one of the best study tools ever. What do you guys think?
I think another reason why C is wrong is because the conclusion is talking about the census. The survey is not the same thing as the census. The method for conducting the survey was DL and post office but the census takes into account all residents regardless of age. So when C says that many people moving in fail to notify DL bureau or post office, this has nothing to do with the conclusion because the conclusion is talking about the census lol...
That said, it's actually attacking the validity of the survey itself, like JY said. Therefore, it weakens a premise of the argument. I had gotten mixed up and thought that C had some implication on the conclusion.