What distinction does the mayor-council system of city government hold?
A. newest and most modern form of city government
B. oldest and weakest form of city government
C. newest and strongest form of city government
D. oldest and most commonly used form of city government

it's D

Explanation:

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workers of lowell mills were greatly benefited for the waltham type of work which was more a paternalist kind, trying to protect the integrity of this little girls coming from small farmers and providing an adequate place of work, this in an effort to avoid the issues of bad place conditions and immorality that the people in bigger industrialized cities of great britain were experimenting.