Why was the classical period of philosophy considered as the most flourishing period in philosphy?

Classical Greece saw a flourishing of philosophers, especially in Athens during its Golden Age. The name classical is applied to the period because in art and literature, there was keen interest in, admiration for, and emulation of the classical artistic and literary heritage of Greece and Rome. It was a time of 'new ideas and new ways of thinking'. More people were leaving the countryside and settling in the cities. More people also began attending concerts, which were usually held outdoors, in parks etc.

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a system of cooperative federalism emerged, as the powers of the federal government expanded.

the answer is   b. coronado.