Answer:
The correct answer is devil's advocacy.
Step-by-step explanation:
Devil's advocacy refers to a decision-making technique which used for the purpose of combating groupthink (making decisions as a group) One or more people from the group take up the role of devil's advocate and go on to pinpoint flaws and risks in the subject under consideration. As discussed in the question, it is used to defend unpopular or opposing alternatives for the sake of debate.