Which of the following best describes "whimsical" in literature?

The word "whimsical" in literature conveys a sense of playfulness, imagination, and unpredictability. When describing a work as whimsical, it often implies that the tone is light-hearted and spirited, engaging readers through delightful and unpredictable elements. Such literature may incorporate fanciful themes, quirky characters, or imaginative scenarios that evoke a sense of wonder or amusement, rather than grave or scholarly undertones.

The other options each suggest a tone or style that contradicts the essence of "whimsical." Describing something as serious and academic indicates a focus on gravity and formality, which is far from the playful nature of whimsy. Similarly, dark and brooding suggests a heavy, somber mood that is quite the opposite of light-heartedness. Predictable and formulaic implies a lack of creativity and surprise, which are hallmarks of whimsical literature. Thus, the characterization of "whimsical" as light-hearted and fanciful captures its core qualities effectively.