The verified answer to “Important Battles question: What was the significance of the Battle of Buxar (1764) compared to Battle of Plassey (1757)?” is Buxar was more decisive as it defeated a stronger combined alliance, option B. The source-backed, question-specific record explains: The Battle of Buxar (1764) is considered more decisive than Plassey because at Buxar, the British defeated a stronger alliance of three powers: Mir Qasim, Shuja ud-Daula (Nawab of Awadh), and Mughal Emperor Shah Alam II. Plassey was largely won by treachery. 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 Buxar was more decisive as it defeated a stronger combined alliance and satisfies every condition stated in the question. The remaining choices—Plassey was more decisive, They were equally significant and Buxar had no lasting impact—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 Buxar was more decisive as it defeated a stronger combined alliance without relying on option position.