How did the industrial revolution effect the production of goods?

a) most goods were now produced by machines rather than by hand
b) it became less expensive to produce items by hand than by machine
c) workers became more involved in all phases of production
d) goods made by machines required fewer raw materials to produce

Which of these is not a criticism of the concentric zone model? it does not accurately describe cities after the rise of suburban development. it only applies to cities that grew after the development of the automobile. it assumes that inner-city areas will always be repurposed instead of abandoned. it places too much importance on the traditional central business district.