The best description of why Wiesel and Spiegelman include Jewish children in their works is B. Both texts reveal how the Holocaust altered the lives of families, especially the children.
The excerpt from Wiesel specifically mentions how the children were "starving, terrified, drained" and marched towards "truth and death." This clearly shows how the Holocaust directly impacted their lives, robbing them of innocence and childhood.
In Maus, Art Spiegelman recounts his father's experiences as a young boy during the Holocaust. The story heavily emphasizes the trauma and loss that the children faced, highlighting the lasting effect it had on their lives and families.