Rulers of the zhou dynasty established the mandate of heaven to a. prove the legitimacy of dynastic rule b. emphasize the need for two emperors at a time c. justify their opposition to democracy d. denounce the superiority of god over man

A.prove the legitimacy of dynastic rule is your answer

Mandate of Heaven was the saying that there should only be one ruler, which the gods approve of. This would rule out B) and D). Because the ruler is approved by the gods, it means that all should obey the appointed king.

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whose power in the senate is equal to the power of the speaker of the house?