Sugar industry is migrating to southern states because ____________.
In recent years, there is a tendency for the mills to shift and concentrate in the southern and western states of India, especially in Maharashtra. This is because the cane produced in here has a higher sucrose content. The cooler climate ensures a longer crushing season. Besides Maharashtra, the other important sugar producers of South India are Andhra Pradesh, Karnataka and Tamilnadu.
Above description shows that all the above options are correct. So correct option is D.