Concept:A co-operative society is a voluntary association formed for the mutual benefit of its members.Explanation:Members voluntarily join together to pool their resources for common economic goals.It is managed democratically, with each member having an equal say in decision-making.The main purpose is self-help and serving members' interests rather than earning profit for outsiders.Hence, it is not a finance house, public corporation, or non-democratic organization.Answer:B. self-help business organization