The correct response is:
That only morally good rulers are allowed to rule, and poor rulers will fall.
The "Mandate of Heaven" was a philosophical and political concept used by the Zhou Dynasty in ancient China to justify their rule and the overthrow of the Shang Dynasty. It posited that heaven would grant its mandate to a just ruler, and if the ruler became corrupt or tyrannical, the mandate would be revoked, justifying rebellion and the establishment of a new ruler.