The British Historians admitted the fact that___________?

A. The standard of education was high during the Muslim rule in the Subcontinent
B. The educational opportunities were in abundance during the Muslim Rule in the Subcontinent
C. Education was free during the Muslim Rule in the Subcontinent
D. All of the following

The correct answer to the question: "The British Historians admitted the fact that___________?" is "All of the following".