The Ilkhanate was a khanate (territory or state ruled by a khan) of the Mongol Empire during the 13th century, which was located mainly in Iran and part of Turkey and Azerbaijan. This khanate was founded by the Mongol ruler Hulagu Khan and was one of the four khanates of the Mongol Empire, also it was a separate state after the fragmentation of this Empire. In this way, the Ilkhanate was located mainly in Iran or Persia, Persia was the name historically used for Iran that was officially changed in the last years to Iran. Thus the correct answer is C. the Ilkhanate of the Mongol Empire was a state located in Persia (Iran).
Charlemagne's friend knew him directly therefore the biography written by his friend would be an example of a primary source being that the author directly experienced him.
