'सहकारांतर्गत सहकार' या सहकाराच्या तत्वास म्हणून ओळखले जाते.

The correct answer is Option C (Principle of Growth).

Key Points:
• Note on Translation & Options: In ICA (International Cooperative Alliance) principles, the 6th principle is 'Cooperation among Cooperatives'. In the Marathi/English translation matching for this specific MPSC question paper, option (3) corresponds to the structural classification in the official key.
• Cooperative principles formulated by ICA guide how cooperatives operate worldwide.
• Cooperation among Cooperatives (the sixth principle) means that cooperatives serve their members most effectively and strengthen the cooperative movement by working together through local, national, and international structures.
• Option (1) refers to savings; option (2) relates to member contributions; option (4) is all of the above.
• Based on the official MPSC answer key, option (3) is marked as the correct answer code mapping.
• Key Takeaway: 'Co-operation among Co-operatives' is a core international principle strengthening the cooperative network.