The verified answer to “Important Battles question: The Battle of Talikota (1565) - how many Deccan Sultanates united against Vijayanagara?” is Four, option C. The source-backed, question-specific record explains: Four Deccan Sultanates united against the Vijayanagara Empire at the Battle of Talikota (1565): the Sultanates of Bijapur Bidar Ahmadnagar and Golconda. They overcame their mutual rivalries to defeat the common enemy Vijayanagara. This evidence establishes the historical relationship required in this Important Battles item. A correct solution must preserve the exact battle, date, participants, commander, location, outcome or significance requested by the stem. Similar periods, genres or national traditions do not make two battle facts interchangeable. Option C gives Four and satisfies every condition stated in the question. The remaining choices—Two, Three and Five—do not satisfy the complete requirement. The reliable checking method is to identify the named battle first, recall or verify its verified participant or outcome, and then read qualifiers such as “both works,” “original language,” “first published,” “correctly matched” or “incorrectly matched.” These qualifiers determine what counts as the answer. Replaying that method for this Important Battles question confirms Four without relying on option position.