Rob Has Appointed Himself to Enforce the Group Norm

Multiple Choice

Rob has appointed himself to enforce the group norm.So during the discussion every time Ralph brings up an objection Rob counters what Ralph has to say.Sometimes criticizing Ralph himself.Criticism of Ralph would be an example of

A) squelching of dissent.
B) closed-mindedness.
C) a group enforcer.
D) formation of a "mindguard."