1. Many psychologists and sociologists now contend that the deliberate and even brutal aggression integral to some forms of competitive athletics increase the likelihood of imitative violence that erupts among crowds of spectators dominated by young adult males.

(A) increase the likelihood of imitative violence that erupts

(B) increase the likelihood that there will be an eruption of imitative violence

(C) increase the likelihood of imitative violence erupting

(D) increases the likelihood for imitative violence to erupt（E）

(E) increases the likelihood that imitative violence will erupt

为什么是单数？

the deliberate and even brutal ）aggression（ integral to some forms of competitive athletics ）中心词是aggression。

likelihood of/likelihood that是惯用法。