i can't give you the answer for 8 marks.but i can just help you to understand the points.
the mughal empire got declined from the destinity of king aurangzeb . he was a very cruel king. and was very selfish. he din't love his followers. in his time , he would take a lot of tax from the peasants.the heritage tax which was end up by the akbar had been started in his empire time. he would not love arts.he was not sufficient powerful to fight with foreigners. many foreigners attacked on india on that time. he himself was corrupt , so how could he had a correct judgement.
please forgive if the answer is not perfect.