Answer:
B. functional region
Explanation:
A region is considered polarized, functional or nodal when it is the result of the reciprocal action of economic and social activities. This concept is based on the notions of mutual influence, dependence and hierarchy.
The predominant character of cities is that of centrality. Every city is a center of business, cultural, economic, administrative in relation to neighboring areas.
A city is like a human body, with each sector linked to the other by the road system, generating a flow that will supply the resident population.
Examples of polarized regions are metropolitan areas and areas of influence in some cities.
