The correct option is B Ahmedabad
The largest cotton producing state in India is Gujarat. Cotton dust is defined as dust present in the air during the handling or processing of cotton, which may contain a fiber, bacteria, fungi, soil, pesticides and other contaminants which may have accumulated with the cotton during the growing, harvesting and subsequent processing or storage periods and causes hazardous effects on health while inhaling. So, cotton dust is an important pollutant here.