This I guess has been taken from the Powerscore CR
bible. The explanation given in the same is quite verbose and clear
Anyways I will try putting it in my own words.
The main conclusion here is: "There is a reason to be skeptical about the conclusion drawn by the magazine's survey"
A and B obviously strengthen it so are eliminated
C can be reworded as "North americans are as much concerned about finances as politics if not less", which again tends to strengthen the premises from which the conclusion is drawn
D -> is more or less like the last line of the stimuli
E -> This answer clearly doesnt impact the conclusion, since it speaks about a new topic i.e social issues which wasn't a part of the stimuli...
Please let me know if this helped