The correct option is D Athens
The city of Athens lived under a radically democratic government from 508 until 322 BCE. Before the earlier date there was democracy to be found here and there in the government of Athens, and democratic institutions survived long after the latter date, but for those 186 years the city of Athens was self-consciously and decidedly democratic, autonomous, aggressive, and prosperous. The Athenian democracy was not, of course, a free-for-all of mob rule. The Athenians understood the value of checks and balances and of enforcing time for reflection before acting. So, Athens was the first city to introduce the classical democracy.