The correct answer is: A. 2
A co-operative society is a voluntary association of persons who have come together voluntarily to meet their common economic, social, and cultural needs and aspirations through a jointly owned and democratically controlled enterprise.
The minimum number of members required for registration of a co-operative society is 2. This is because a co-operative society is a voluntary association, and it is not possible for a single person to form a co-operative society.
The other options are incorrect because they are not the minimum number of members required for registration of a co-operative society. Option B is incorrect because the minimum number of members required for registration of a co-operative society is 2, not 7. Option C is incorrect because the minimum number of members required for registration of a co-operative society is 2, not 10. Option D is incorrect because the minimum number of members required for registration of a co-operative society is 2, not 20.