Important Battles question: Who betrayed Siraj ud-Daulah at the Battle of Plassey?

The verified answer to “Important Battles question: Who betrayed Siraj ud-Daulah at the Battle of Plassey?” is Mir Jafar, option C. The source-backed, question-specific record explains: Mir Jafar the commander-in-chief of Siraj ud-Daulah's army conspired with Robert Clive and did not engage his troops in the Battle of Plassey 1757. This treachery led to Siraj's defeat and Mir Jafar became the new Nawab. 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 Mir Jafar and satisfies every condition stated in the question. The remaining choices—Omichand, Mir Qasim and Rai Durlabh—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 Mir Jafar without relying on option position.