What is the theory called that seeks to explain how societies are bound or linked together

Discuss how you should organize to optimize learning. 

What will be an ideal response?

After the events of 9/11, the tourism industry suffered a significant economic setback. This illustrates ________.

A. health concerns can dramatically impact the tourism industry B. political events can dramatically impact the tourism industry C. language ability can dramatically impact the tourism industry D. the need to stay at home