Answer: the answer is C. Political Distance.
Explanation: Political distance is a phenomenon that is created by the differences that exist in governmental laws, policies, and institutions, and also including international relationships between countries, treaties, and membership in international organizations.
From the scenario presented above, we can see that both nations share a common language, but there exists a dispute regarding the control of an area of land along their common border, this indicates that there is a difference in their system of governance which can be tagged as political distance.
This will prevent Calabash from easily expanding into East Fenwick.