The establishment of the polis or "city-state" was the greatest political achievement of this society. The polis was a single city around which all political units in the area were centered. All of the city-states controlled their own land and were independent from one another. Sparta was the largest of the city-states. At one time, it controlled more than 3,000 square miles of surrounding territory.

Which of these societies is described by the passage above?
A.
Indus River Valley
B.
Greece
C.
Ancient Egypt
D.
Mesopotamia