Answer: A. Birthright
Explanation: Pharaoh in ancient Egypt was elected on the basis of hereditary right, i.e. birthright, since Pharaoh was the most powerful personality. This meant that he was a secular, political and religious ruler. Inexorably made all decisions, determined taxes, conducted military campaigns, and so on. As a religious ruler, he was the supreme priest of every temple.This is why Pharaoh could not have been anyone, since the pharaohs had the status of a deity or a half-deity. This means that Pharaoh could only be chosen from the Pharaoh's family, so he continued the divine line, until some other dynasty would come to the throne, claiming its royal, divine nature.