Hi Mike,
I have a question here

it's a bold-face question from you post.
2. The Interstate Bridge over the Apache River, built in the 1950s, shows a substantial amount of rust: as much as 45% of its surface is coated in rust. Community activists have argued that
the bridge presents a hazard: it is likely to collapse in places where it has rusted through. Professors of mechanical engineering at the local university did an extensive analysis of the bridge. These professors and their graduate students determined that 98% of the rust on the bridge exists on the surface only, and actually seals the underlying steel from the corrosive influence of the elements. The results of this academic study suggest that
the bridge is safe for continued use.
In the argument given, the two portions in boldface play which of the following roles?
(A) The first is evidence in support of the conclusion; the second is that conclusion.
(B) The first is the main conclusion of the argument; the second provides evidence that calls this conclusion into question.
(C) The first is evidence taken to support one conclusion; the second provides evidence that calls this conclusion into question.
(D) The first is a position that the argument opposes; the second is the conclusion of the argument.
(E) The first is an interpretation of evidence; the second calls that evidence into question.
The OA is D, but I still think E is right. I have 2 reasons.
First, I don't think the argument in this stem has a opposite relation. The author just stated the fact.
The second, which made me to choose D, is that E makes sense.
I got the rest of the 2 question. but I stuck in this one. Thanks in advance

Wait! I got it! It's not the evidence is wrong, but the interpretation of the evidence is doubtful. This makes E out.
Well, I still decide to post this because other folks may have the same problem.