The correct answer is C. Minoan
Explanation:
The Minoan civilization lived mainly in Crete and other Aegean Islands (Greece) from 2700 to 1100 BC, this civilization is believed to be earliest civilization in Europe, which implies they were not only the first true civilization in Greece but the in the European continent; additionally the Minoan civilization was notable for its plumbing systems and palaces. On the other hand, Other Greek civilizations emerged after the Minoan; the Mycenaean emerged in the 1600 BC, the Spartan in the 900 BC and the Athenian in 500BC, which implies the Minoan was the oldest civilization among Greek people.