Nadir Shah’s 1739 invasion targeted major Mughal centers such as Lahore, where he first entered India; Karnal, where he defeated the Mughal army; and Delhi, where he carried out a brutal massacre and seized enormous treasure, including the Koh-i-Noor diamond and Peacock Throne. His campaign was swift, destructive and strategically focused on regions that posed direct political and financial value. Kannauj, once important in early medieval India, had lost much of its significance by this time. Consequently, Nadir Shah never marched toward or attacked Kannauj, making it the correct answer.