GMAT Sentence Correction (SC) | Re: According to criminologists, the cause of riots among many

According to criminologists,the cause of riots among many segments of the population is not so much that rioters are being primed for violent behavior by their parents or to rebel against oppressive regimes by the media as that the rioters are spontaneously spurred to action by a specific incident.

(A) the cause of riots among many segments of the population is not so much that rioters are being primed for violent behavior by their parents or to rebel against oppressive regimes by the media
(B)