The correct answer is A) vizier.
During the Abbasid dynasty, the council that advised the caliph was led by a prime minister known as a vizier.
The vizier was an equivalent of a Chief Minister in the Abbasid Caliphates. It was a prominent political figure in Muslims governments that served as a counselor due to his knowledge and experience. The vizier figure was also used in later years in places such in other nations such as the Persians, the Arabs, the Mongols, and the Turks.
