Answer :
Answer:
Option: D) Overcrowding and lack of sanitation created public health problems.
Explanation:
Industrialization changed the life of the people during the beginning of the 1800s. Majority of the rural people moved out of their county side to urban to find a better opportunity and to start a new life. The rural population led to the rise of urbanization in towns and cities. Overcrowding of people lacked sanitation because of their low wages allowing them to stay in unhygienic places.