The Dynastic Cycle explains how a family of rulers claims and then loses the Mandate of Heaven. Thus the option (A) is correct.
Mandate of Heaven was the belief that Chinese ruler has got all the rights to rule the country for many years. It also believed that there must be only one ruler at a time.
It was considered that the right to rule was given to the ruler by the god which was known as heaven or sky. Mandate of the heaven important part of consideration was that the ruler will fair and will rule for the good.
Thus the mandate of heaven showed the rise and fall of the dynasty as it explained the how a family of rulers claims and then loses the Mandate of Heaven.
Thus the option (A) is correct.
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