The correct answer is D) They were all located on islands.
The statement that does not describe early Greek city-states is "They were all located on islands."
Not all ancient Greek city-states were located on islands. For instance, the Spartans and Athenians lived on the land.
The two most important city-states in ancient Greece were Athens and Sparta, both established inland.
Athens was the birthplace of Democracy with Cleisthenes. It was the place of great thinkers and philosophers like Socrates, Aristotle, and Plato.
Sparta was the land of the warriors. Since childhood, boys were trained to be fierce warriors.
Unfortunately, both city-states waged war during the so-called Peloponnesian Wars. Sparta defeated Athens, but this war weakened Greece.