Under which of the following Mughal emperors were the Marathas a major challenge to the sovereignty of the Mughals?

* During the reign of Aurangzeb, the Marathas under Chhatrapati Shivaji Maharaj and subsequent Maratha rulers emerged as a formidable challenge to the Mughal Empire.
Aurangzeb spent the last 25 years of his reign (Deccan Campaigns) actively fighting the Marathas, which severely exhausted the resources and treasury of the Mughal Empire.