B. it strengthens their sense of being different from surrounding states.
Explanation:
"Humans want to belong, whether to a group, a family, a culture, or a belief system. This sense of belonging can also be applied to a state or a region, and is an important part of maintaining and acknowledging differences between groups. "
It was developed in 1963 by John Friedmann. The core periphery model shows spatially how economic, political, and cultural authority is dispersed in core or dominant regions and the surrounding peripheral and semi-peripheral regions.
UNICEF or known as the United Nations International Children's Emergency Fund is a special agency that is tasked to provide long term humanitarian care to children and even to mothers especially in the developing countries that have hard time meeting their own needs.