Final answer:
The legitimacy of a monarch who is believed to have been granted power by God is described as divine right.
Step-by-step explanation:
The correct answer is d. Divine right.
Divine right is a theory that suggests that a monarch gains power directly from God, and that their authority is legitimate and absolute. This belief was prevalent during the medieval and early modern periods in Europe, and it was used to justify the rule of monarchs. According to the doctrine of divine right, a monarch was considered to have a divine mandate to rule, and their power was seen as granted by God, making their authority unquestionable.
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