Final answer:
The Arab Empire's government practices can be accurately described as a theocracy, with the rulers considered successors to the Islamic prophet Muhammad.
Step-by-step explanation:
The Arab Empire's government practices can be accurately described as a theocracy. In a theocracy, the rulers claim to govern on behalf of a divine being or religious authority. The Arab Empire was ruled by caliphs, who were considered successors to the Islamic prophet Muhammad and were seen as both political and religious leaders.