Answer:

C. country cluster

Explanation

By definition, a socio-economic environment refers to the systems and structures that affect distribution of goods and services. Many multinationals tend to think in terms of clusters when developing business strategies, plans for marketing their goods, staffing plans etc. Country clusters are a group of countries where both the countries and consumers share the same socio-economic environments. An example of a cluster is the Canada and the US and may also include the North and South AMerica as one big cluster.