The correct options are
B Mahmud Gawan became the Prime Minister during the reign of Sultan Muhammad Shah III.
C Mahmud Gawan called Arabian chemists to teach the Bahmani army about the preparation and use of gunpowder.
D The entire administrations were run according to the Islamic laws.
Mahmud Gawan was a military officer recruited in the Bahmani military. While planning war against Vijayanagar kingdom, he called in Persian chemists to teach the Bahmani army about the preparation and use of gunpowder.