The work "Siyar-ul-Mutakherin" is a historical book that provides a detailed explanation about Battle of Plassey, 1757.

Option 1: Salabat Jung was a ruler of the Hyderabad State in Southern India, and he was not associated with the writing of Siyar-ul-Mutakherin.

Option 2: Qasim Khan isn`t known to have written any notable texts or books in history, thus this option is not the right answer.

Option 3: Ghulam Husain is the correct answer. Ghulam Husain was an Indian historian who lived in the latter half of the 18th century and he authored the Siyar-ul-Mutakherin, which provides a rich account of the Battle of Plassey and other historical events from that time in India.

Option 4: Ram Mohan Roy was an influential social and religious reformer in India, not a historian. He is recognized for efforts in abolishing sati and promoting women`s education, not for writing Siyar-ul-Mutakherin.