The correct answer is option 3, Kolkata - Guwahati. The policy initiatives for industrial corridors aim to promote and develop specific areas as industrial hubs with modern infrastructure and connectivity.

Option 1, Amritsar - Kolkata, is part of the Eastern Dedicated Freight Corridor and is recognized as an industrial corridor. It aims to enhance connectivity between industries in Punjab and West Bengal.

Option 2, Delhi - Mumbai, is known as the Western Dedicated Freight Corridor and is a prominent industrial corridor. It connects major cities like Delhi and Mumbai, promoting trade and investment in these regions.

Option 4, Chennai - Bengaluru, is part of the Chennai-Bengaluru Industrial Corridor (CBIC). It is an important industrial corridor in South India and focuses on developing infrastructure and industries in Tamil Nadu and Karnataka.

However, option 3, Kolkata - Guwahati, is not recognized as an industrial corridor as per the policy initiatives. While Kolkata and Guwahati are important cities with economic significance, they are not officially designated as a specific industrial corridor.

It is important to note that these policy initiatives may evolve over time, and there may be updates or additions to the official list of industrial corridors.