The correct option is D 1540
Battle of Kannauj was fought between Sher Shah Suri and the king Humayun in 1540. King Humayun knew that Sher Shah Suri's army is more powerful and it is not easy to get over him in this war. Just because of this Humayun tried to involve his brothers with him for this war but his brother not involved with him, instead of they began putting many obstacles in the way of war preparations.