Which of the following has no limit to its membership?

Explanation

Option A is ordinary partnership. In an ordinary partnership, there is a limit to the number of partners who can join the partnership. Once the maximum number of partners is reached, no additional partners can be added. Therefore, option A is not the correct answer.

Option B is private limited company. In a private limited company, there is a limit to the number of shareholders or members who can own shares in the company. This limit is usually set by the company's articles of association. Once the maximum number of shareholders is reached, no additional shareholders can be added. Therefore, option B is not the correct answer.

Option C is limited partnership. In a limited partnership, there are two types of partners: general partners and limited partners. The number of general partners is usually limited, but there is no limit to the number of limited partners. Limited partners do not have the same level of control and liability as general partners. Therefore, option C is not the correct answer.

Option D is co-operative society. A co-operative society is an organization formed by a group of individuals who come together voluntarily to meet their common economic, social, and cultural needs and aspirations. Unlike the other options, there is no limit to the number of members who can join a co-operative society. This means that anyone who meets the requirements for membership can join a co-operative society. Therefore, option D is the correct answer.

In conclusion, the correct answer to this question is option D: Co-operative Society.