Ahmedabad-Surat Region is not a major industrial region of India. It is a major commercial and financial center.

Mumbai-Pune Region is the largest industrial region of India. It is home to a large number of industries, including textiles, chemicals, pharmaceuticals, and engineering.

Chennai-Bangalore Region is the second largest industrial region of India. It is home to a large number of industries, including automobiles, electronics, and software.

Kolkata-Howrah Region is the third largest industrial region of India. It is home to a large number of industries, including jute, cotton, and engineering.

Ahmedabad-Surat Region is the fourth largest industrial region of India. It is home to a large number of industries, including textiles, chemicals, and pharmaceuticals.

Engineering is the major industry of the Mumbai-Pune Region.

Automobiles is the major industry of the Chennai-Bangalore Region.

Jute is the major industry of the Kolkata-Howrah Region.

Textiles is the major industry of the Ahmedabad-Surat Region.

All of the above factors are responsible for the growth of the Mumbai-Pune Region.

All of the above factors are responsible for the growth of the Chennai-Bangalore Region.

All of the above factors are responsible for the growth of the Kolkata-Howrah Region.

All of the above factors are responsible for the growth of the Ahmedabad-Surat Region.

All of the above challenges are faced by the Mumbai-Pune Region.

All of the above challenges are faced by the Chennai-Bangalore Region.

All of the above challenges are faced by the Kolkata-Howrah Region.

All of the above challenges are faced by the Ahmedabad-Surat Region.