The statement that best compares the causes of absolute monarchy and constitutional monarchy is:
Absolute monarchy and constitutional monarchy both emerge based on belief in the divine right of kings, but that right is universally embraced in an absolute monarchy and rejected in a constitutional monarchy.
This statement highlights the differing foundations of legitimacy and acceptance of monarchical power between the two forms of monarchy. In absolute monarchies, the monarch's authority is often justified by the divine right to rule, whereas in constitutional monarchies, such divine rights are typically constrained by constitutions or laws that recognize the role of other governing bodies or the populace.