Devil's advocacy in the mechanism in which a person from the group is chosen to act as a critic who states his view-point on decision that has been made .In this process, quality of the decision is improved as group-think mechanism is degraded.
Other options are incorrect because dialectical inquiry,group-think,delphi and dyadic communications are not the manner in which a person of community is permitted to act as the critic for the decision.Thus, the correct option is option(b).
