The source-backed, question-specific record explains: On the Origin of Species is correctly associated with Charles Darwin. The work’s first publication is conventionally dated to 1859, and its original language is English. These three details—title, author, and language—form the decisive bibliographical combination required here. Charles Darwin, a major British literary figure, is also associated with The Descent of Man; that companion title helps confirm the authorship independently rather than through guesswork. The distractor set (It is a English-language work by Adam Smith, first published in 1776.; It is a German-language work by Karl Marx, first published in 1867.; It is a English-language work by William Dalrymple, first published in 2006.) must therefore be tested as complete statements: one true fragment cannot make an entire option correct. A candidate should first lock the title to its writer, then check the language, and finally use 1859 as a chronological cross-check. A common examination trap is to confuse an author’s nationality with the language of composition, or a translation date with first publication. Another is to treat a well-known adaptation or later edition as the original work. Revision takeaway: remember the compact chain “On the Origin of Species — Charles Darwin — English — 1859,” and connect it with The Descent of Man for stronger recall. This evidence establishes the bibliographic relationship required in this Books and Authors item. A correct solution must preserve the exact title, author, publication context, language, award or comparison requested by the stem. Option A gives It is a English-language work by Charles.