The 3 authors purposes are persuade, inform and entertain. Persuade the author is using their opinion to try and get you to agree, inform the author is explaining a topic with facts and without bias, and entertain the work doesnt have either of those it will be amusing or fun
If a star is small, it will remain in the main sequence longer than a large star.
D is the answer. Motif's come from the author/composer as part of a work. Archetypes are believed to be universal across all works.