The idea of the Mandate of Heaven was:

A. introduced in the Bhaghavadgita.

B. borrowed from Tibetan nomads in the fifth century B.C.E.

C. introduced by the Zhou dynasty and it served to legitimize its power.

D. contained in the Rites of Mao.

The idea of the Mandate of Heaven refers to an ancient Chinese concept that is believed to have been introduced by the Zhou dynasty. This concept served to legitimize the Zhou dynasty's authority and power. Therefore, the correct answer is C.

To arrive at this answer, you can eliminate options A, B, and D as they are factually incorrect. The Bhaghavadgita is part of Hindu scripture and does not mention the Mandate of Heaven. Tibetan nomads and the Rites of Mao are unrelated to the concept of the Mandate of Heaven. By process of elimination, C is the correct answer.

C. introduced by the Zhou dynasty and it served to legitimize its power.

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