The Great Cities of the World Grew Up Along with the Modern

The great cities of the world grew up along with the modern factory,which drew hundreds of millions of people out of the countryside and transformed them into urban,industrial workers.Therefore,sociologists say that:

A) urbanization results from industrialization to a degree
B) industrialization was created by urbanization
C) urbanization causes industrialization
D) urbanization and industrialization are coincidental developments
E) none of these choices