Which of the following best describes the author's purpose in the passage?
(A
To provide detailed descriptions of the instruments used at the Maragha and Tabriz observatories
(В
To evaluate the importance of the astronomical discoveries made by Ilkhanid scientists
C
To portray his patron as a generous supporter of the sciences and a man of unusual intelligence
D
To criticize Ghazan for his vanity and remind him to focus on religious and spiritual pursuits