The concentration of industries in urban centres of developing countries is due to all the following except

The concentration of industries in urban centres of developing countries is due to several reasons, such as high demand, availability of labor, and presence of infrastructural facilities. However, one of the following options is not a reason for this concentration of industries, and this is "location of raw materials." Industries in developing countries often depend on imported raw materials, which are usually transported from the ports to the urban centres, where the industries are located. Therefore, the location of raw materials is not a significant factor in the concentration of industries in urban centres of developing countries.