What factor played the most significant role in the decline of the Mughal empire

Mughal leaders began to abandon policies of religious tolerance

is the answer as of Apex 2018

In fact, the decline began during the last days of Aurangzeb. There were many causes for the downfall of this great dynasty. Let us view the causes that hastened the fall of the Mughal Empire after Aurangzeb. Aurangzeb's responsibility:Aurangzeb was largely responsible for the downfall of the empire.