Answer:
B. limiting families to only one child
The Atlantic Ocean is the answer to the question.
It protects us from harmful UV rays from the sun.
The correct answer is - urbanization.
The process of urbanization is the one associated with the growth and development of the cities. This process takes place when there's a growing population in a city, both caused by fertility rates and migration towards it, so the local authorities are making the peripheries of the cities and surrounding villages modernized and start to put institutions in them, as well as the necessary modern infrastructure.
