Answer:
Option A.
Step-by-step explanation:
The rapid growth of cities was bringing about overcrowding and crime, is the right answer.
A reform movement is a kind of social progress that strives to carry a political or social system closer to the ideal of a community. A reform movement is separated from more progressive social actions like revolutionary movements which discard those traditional ideals in the doctrines are usually floored in liberalism, though they can have roots in socialist or religious ideas. However, the rapid growth of cities that resulted in overcrowding and crime gave rise to an age of reform.