The verified answer to “Important Battles question: The Battle of Colachel (1741) was the first instance of an Asian power defeating a European colonial power. Who won this battle?” is Travancore under Marthanda Varma defeated the Dutch, option B. The source-backed, question-specific record explains: The Battle of Colachel (August 10, 1741) was fought between the Kingdom of Travancore (under King Marthanda Varma) and the Dutch East India Company. The Travancore forces won decisively, and the Dutch never recovered their power in 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 Travancore under Marthanda Varma defeated the Dutch and satisfies every condition stated in the question. The remaining choices—Hyder Ali defeated the French, Marathas defeated the Portuguese and Ahoms defeated the British—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 Travancore under Marthanda Varma defeated the Dutch without relying on option position.