Correct Answer: (e) None of the above/More than one of the above
Solution:As per options none of the sultans opposed the power of the Caliph. Iltutmish had definitely obtained recognition from the Khalifa, but sultan Ghiyasuddin of bengal bad also obtained recognition from the Khalifa, by attacking which, Iltutmish had in a way opposed the power of the Khalifa. Alauddin Khalji, balban, Muhahmad Bin Tughlaq were practically independent rulers but none opposed the power of authority of the caliph. There was only Mubarak Khalji who himself took the title of Caliph thus he opposed the authority of the Caliph.