Which of the following criteria is used to study a state by political geographers?

A. Power over the people of an area unrestrained by laws originating from outside the area.

B. Recognition by a significant portion of the international community.

C. Definite portion of earth's land surface with recognized limits.

D. Administrative system to perform functions needed or desired by the people.

E. Organized means of transmitting goods, people, and ideas from one part of territory to another.

Choose the correct answer from the options given below: