AThe first provides context for a current state of affairs; the second is a prediction based on that state of affairs.
BThe first is a statement of fact in opposition to the author's conclusion; the second supports that conclusion.
CThe first lays the background for the author's principal contention; the second is that contention.
DThe first is information the author suggests has been overlooked in the situation at hand; the second describes that situation.
EThe first provides data to support the author's conclusion; the second verifies the validity of those data.