Answer: d) Group Contingency
Explanation:
Group Contingency is defined as single outcome that received through the behavior displayed by the cluster of people in group or any individual of the group.The outcome that is received can be in the form of reward or disliked feedback.This type of consequence is implemented on the complete group members.
Other options are incorrect because disappearance, token economy and contract of contingency is not the result that is obtained from behavior of group or single person of group.Thus, the correct option is option(d).