The source-backed, question-specific record explains: The second victory at Tarain removed a major Chahamana obstacle and enabled Ghurid commanders, especially Qutb-ud-din Aibak, to extend authority in north India. It did not by itself create every later institution of the Delhi Sultanate, and this formulation avoids duplicating the separate question asking who defeated Prithviraj. This evidence establishes the historical relationship required in this Important Battles item. Option A gives Ghurid commanders expanded into the Delhi-Ajmer region and satisfies every condition stated in the question. The remaining choices—The Mughal Empire was founded immediately, Vijayanagara occupied Delhi and The Marathas annexed Punjab—do not satisfy the complete requirement. Replaying that method for this Important Battles question confirms Ghurid commanders expanded into the Delhi-Ajmer region without relying on option position.