It Is Argued in Your Text That Certain Problems Continually

It is argued in your text that certain problems continually appear and then fade in waves of concern because

A) there are objective peaks and recessions in the extent to which a problem is presented.
B) high-profile incidents draw public attention to the problem, thereby reviving concerns.
C) certain constructions are simply a good match with a particular culture and become ongoing concerns.
D) people fail to understand the problem and periodically lose interest in it.
E) b and d only