Assertion: The mid-first millennium BCE is often considered a turning point in world history.
Reason: It saw the emergence of thinkers such as Zarathustra in Iran, Kong Zi in China, Socrates, Plato and Aristotle in Greece, and Mahavira and Gautama Buddha, among many others, in India.

Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

During the mid-first millennium BCE, a pivotal era in world history unfolded, marked by the rise of influential thinkers across different regions. In Iran, Zarathustra emerged as a prominent figure, while China witnessed the teachings of Kong Zi. Greece experienced the profound wisdom of Socrates, Plato, and Aristotle, while India witnessed the profound insights of Mahavira and Gautama Buddha, among others. These visionaries sought to delve into the enigmas of existence and unravel the intricate relationship between humanity and the cosmic order.