Important Battles question: The Battle of Diu (1509) between the Portuguese and a Muslim coalition - who organized the coalition against Portugal?

The verified answer to “Important Battles question: The Battle of Diu (1509) between the Portuguese and a Muslim coalition - who organized the coalition against Portugal?” is Mamluk Sultan of Egypt allied with Gujarat Sultanate, option B. The source-backed, question-specific record explains: The Battle of Diu (February 3 1509) was a decisive naval battle where Portugal defeated a combined fleet of the Mamluk Sultanate of Egypt and Gujarat Sultanate. This Portuguese victory established their dominance over Indian Ocean trade routes. 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 B gives Mamluk Sultan of Egypt allied with Gujarat Sultanate and satisfies every condition stated in the question. The remaining choices—Bahmani Sultanate, Vijayanagara Empire and Zamorin of Calicut—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 Mamluk Sultan of Egypt allied with Gujarat Sultanate without relying on option position. This approach builds accurate historical knowledge and careful option elimination for SSC, Railway, Banking, Defence, State and other competitive examinations.