Political Machines Spread and Thrived in Urban Areas During the Late

Political machines spread and thrived in urban areas during the late nineteenth century because

A) they were able to provide much-needed services to urban residents
B) they represented efficiency and honesty in an age of political corruption
C) people were tired of the autocratic nature of existing city governments
D) the middle classes were angry at the favoritism shown by existing city governments to the urban poor and ethnic minorities