The Johns Hopkins Center for Gun Policy and Research

The OA is E.

Source - Princeton Verbal Workout

The following is the explanation:-
Here's a stellar example of the subject-verb sucker punch. Many students are
inclined to pick (A) because "adults carry" makes sense to the ear. But the
subject of this latter thought is "one", which needs to be paired up with the
verb "carries". Use the two/three split and cross off (A) and (B). The rest comes
down to the proper use of the statistics cited in the sentence. (C) and (D) are
incorrect because they use "every" and "each", which suggest that if you take
fifty people off the street and put them in a room, exactly one will be carrying
a handgun. But the point of the sentence is to establish a more general ratio: for
every forty-nine people who don't pack heat, there is one person who does.