The correct answer is: C. 1700 A.D.
Murshid Quli Khan was appointed as the diwan of Bengal in 1700 A.D. by Aurangzeb, the sixth Mughal emperor. He was a Persian nobleman who had served in the Mughal army for many years. He was a capable administrator and a shrewd politician. He was also a patron of the arts and literature. He was instrumental in the development of Bengal as a major economic and cultural center. He died in 1727 A.D.
Option A is incorrect because 1500 A.D. is too early. The Mughal Empire was not yet established in Bengal in 1500 A.D.
Option B is incorrect because 1600 A.D. is too early. The Mughal Empire was still in its early stages of development in 1600 A.D.
Option D is incorrect because 1800 A.D. is too late. Murshid Quli Khan died in 1727 A.D.