Which of the following was not an issue in big cities during the industrial revolution? lack of immigrants to fill working needs overcrowded tenement buildings poor sanitation and health problems sickness and disease caused by poor diets

The answer is: lack of immigrants to fill working needs

It's actually the other way around. During the industrial revolution, many immigrants come to big cities because they heard that there was a lot of job opportunities there.

Since they have to compete with one another, many of them unable to obtain any jobs in the cities and they have to trapped in bad living condition.

b or c im pretty sure

after the roman empire, the catholic church began to unify by taking on many duties of a government.