Step 1: Understanding Co-operative Banks.
Co-operative banks are set up to serve the needs of weaker sections of society, especially poor farmers and small borrowers.
Step 2: Analyzing the options.
(A) Labourers – Not specifically labourers.
(B) Weak individuals – Not precise.
(C) Rich individuals – Incorrect, co-operative banks are not meant for the rich.
(D) Poor farmers – Correct, co-operative banks focus on providing credit to poor farmers.
Step 3: Conclusion.
Thus, co-operative banks are organisations of poor farmers.