The correct option is C 24th December 1737
After the death of Aurangzeb the Mughal empire lost its previous strength and glory. It was attacked by Martahas in 1737 (Battle of Delhi). The returning army of Marathas was intercepted by allies of Mughals (Rajputs, Nizam of Hyedrabad, Nawab of Oudh and Bhopal) on call of help from Mughals. The combined forces of Mughal Allies were defeated by Marathas in this Battle of Bhopal. This exposed the weakness of Mughal empire and strengthened the position of Marathas.