Correct answer: D. Blood and iron
Explanation: The direct answer is D, blood and iron. Balban ruled the Delhi Sultanate and is remembered for a strong, strict policy of kingship. The phrase means maintaining authority through firm discipline, fear of rebellion, a powerful army, and severe action against disorder. Reasoning: Balban faced internal revolts and threats; he therefore strengthened the position of the Sultan, demanded strict obedience, and used force to protect the state. Option A, Dhamma conquest, belongs to Ashoka’s idea of spreading moral policy rather than Balban’s rule. Option B, Sulh-i-kul, means universal peace or tolerance and is especially associated with Akbar, not Balban. Option C, non-violence as the supreme duty, is a moral principle connected with Indian religious and philosophical traditions, not Balban’s hard political method. Option D is correct because “blood and iron” summarizes his severe and centralized style of governance. Memory cue: Balban means strong Sultan, strict discipline, and blood-and-iron policy.