Which color was found to be most effective for boosting sales of literary fiction book covers according to a 2019 Penguin Random House marketing study?

Publishing houses and bookstores know that a book's cover design and color scheme can significantly impact sales. Color psychology plays a crucial role in marketing literature to different demographics. This trivia question examines how major publishing houses have utilized specific color strategies in their most successful product launches over the past decade, revealing the fascinating intersection of visual design and literary marketing.

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Dark Blue (creates perception of depth and sophistication)
Vibrant Red (stimulates emotional response and urgency)
Muted Yellow (associated with creativity and optimism)
Forest Green (conveys growth and intellectual appeal)