The correct options are
A The administration followed the Quran.
C The sultan was the commander in chief of the Army.
D There was a Central level and Provincial level of administration.
Since the Sultanate followed Islam, the administration followed the Quran, the holy book of Islam. The administration was well defined. It had a Central level and Provincial level of administration. The central administration was headed by the Sultan. He was also the highest authority of the judicial department. From the military aspect, he was the commander in chief of the Army. He did not carry out all these functions on his own, he was assisted by ministers.