4. _____ (Para. 16)
选项：

A: We are fearful, and so wedevise ways to lock the fear out.
B: In rural areas as well as in cities, doors do not stay unlocked, even for part of an evening.
C: Who is going to make the psychic payment for the transformation of America from the Land of the Free to the Land of the Lock.
D: We may have locked the evils out, but in so doing we have locked ourselves in.