Answer:
C. There was a lack of housing in the cities
Step-by-step explanation:
Urbanization occurs when lots of people move from rural areas to the city in order to find work. We can use the fact to find the right answer choice.
A is incorrect because too many people moving to rural areas is the opposite of urbanization.
B is incorrect because if there are lots of people moving to cities in order to work in the factories, then there would be more than enough workers for the factories.
C is correct because there wasn't enough space for everyone that moved to the city, creating a lack of housing.
D is incorrect because crime wouldn't decrease if more people moved area from rural areas - in fact, crime would most likely decrease because there was less people there.
I hope this answers your question. :)