The correct answer is: a) AMUL
AMUL is an Indian dairy cooperative established in 1946. It is one of the largest cooperatives in the world, with over 3.6 million members. AMUL is known for its success in marketing milk and milk products, and has been credited with helping to improve the lives of millions of farmers in India.
NAFED is the National Agricultural Cooperative Marketing Federation of India. It is a government-owned organization that was established in 1958. NAFED is responsible for marketing agricultural produce, including milk. However, it does not play a major role in the dairy cooperative movement in Gujarat.
NDDB is the National Dairy Development Board. It is a government-owned organization that was established in 1965. NDDB is responsible for promoting dairy development in India. It has played a significant role in the success of the dairy cooperative movement in Gujarat, but it is not the only organization that has played a role.
Reliance Industries is an Indian multinational conglomerate company. It is one of the largest companies in India, and is involved in a variety of businesses, including energy, petrochemicals, textiles, and retail. Reliance Industries does not play a role in the dairy cooperative movement in Gujarat.