Interesting. You're positive the NA isn't actually necessary? I'm curious about these examples. I didn't look closely at it, but PT 71.S1.Q11 seems to be about pollution. Is that the right reference? PT means PrepTest, right?
In Prep-Test 76 the system scored me wrong on S1 Q18, when my answer matches the solution table supplied with the prep-test and other online resources.
I simply do not understand how the answer choice parallels the stimulus at all. Can anyone explain it to me to help me understand? Thank you! PT8.S1.Q16.