Answer:
c. It can be valuable because people are tied more closely to the area where they live.
Explanation:
In this context, self-sufficiency refers to people's ability to utilize all the resources available around them to fulfill their needs.
During the process of fulfilling their needs , people will start to make communication with one another along with making various inventions that could benefit the environment around them. In the long run, this will lead to the creation of strong and sustainable societies.