Concept:Co-operative societies follow the democratic principle of equal voting rights for every member.Explanation:In a co-operative society, each member is entitled to only one vote, regardless of the number of shares held.This is known as the principle of "one man, one vote".It ensures that all members have equal control, whether they hold few or many shares.Other business organisations like limited companies give votes based on shareholding, and partnerships decide voting by agreement, not by shares.Answer:D. Co-operative society