The correct answer is: It highlights Magda’s motivation.
Including Wen in the narrative helps illustrate Magda's motivation for finding the special book. Unlike Wen, who seeks the book for personal gain and to become the ruler, Magda is motivated by a desire to reverse the curse and fix the damage done to her country. This contrast emphasizes Magda's selflessness and dedication to her homeland, thereby deepening the reader's understanding of her character and the stakes of her quest. The presence of Wen serves to clarify what is at stake and further motivates Magda's actions as she seeks to ensure the curse's power is not misused.