A(n)__ conveys an important idea by using a pattern repeatedly within a story A. archetype
B. motif
C. cliché
D. flashback

The answer is Motif .

A motif is a recurring concept or story element in literature. It includes concepts such as types of incident or situation, as in the parting of lovers at dawn; plot devices, such as the lady's love token, which inspires courage in her lover, or the recognition tokens in plots of mistaken identity; plot formulas, such as the "loathly lady" who later becomes a beautiful princess, or the "femme fatale" whose attraction proves deadly; and character types, such as the despairing lover, conquering hero, or wicked stepmother. In a more narrow sense, "motif" is also used to describe recurring elements within particular works, such as phrases, descriptions, or patterns of imagery.