The verified answer to “Important Battles question: The Battle of Rajasthan (738 CE) is a collective name for battles that stopped whose invasion?” is Arab Umayyad forces, option B. The source-backed, question-specific record explains: The Battle of Rajasthan (c. 738 CE) is a collective name for battles where a Rajput confederacy led by Nagabhata I of the Gurjara-Pratihara dynasty and Pulakesi of the Chalukyas repelled the Arab Umayyad forces from expanding into India. 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 Arab Umayyad forces and satisfies every condition stated in the question. The remaining choices—Mahmud of Ghazni, Timur and Nadir Shah—do not satisfy the complete requirement. Depending on the stem, a distractor may name a real commander but attach the wrong title, use a related event involving another power, reverse a correct association, or present a correct statement when the question specifically asks for the incorrect match. 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 Arab Umayyad forces 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.