Correct Answer: 1868
Subject: 2025
Explanation: <b>Key Fact</b><br>The Bihar Scientific Society was established in 1868 at Muzaffarpur by Syed Imdad Ali to promote modern education and translate scientific literature into vernacular languages.<br><br><b>Additional Info</b><br>Topic: Modern History of Bihar.<br><br><b>Why the other options are wrong</b><br>Option A: 1919 is the year of the Rowlatt Act and Jallianwala Bagh.<br>Option B: 1921 is associated with the Non-Cooperation movement.<br>Option C: 1899 is incorrect.<br>Option D: Correct.<br><br><b>Exam Trick</b><br>Formed shortly after Sir Syed Ahmad Khan's Scientific Society of Aligarh (1864) — Bihar Scientific Society = 1868.<br><br><b>Final Answer</b><br>Option D — 1868.