The dialogue that best helps develop both characters for readers is C: “We’re going to have so much fun,” Sadie said. “I bet we’ll get to meet the band. I bet we’ll even get to hang out with them!” “We probably won’t even get to go,” Marco said. “I bet the whole show will get canceled and we’ll have a terrible day.”
This option effectively showcases Sadie's optimistic nature as she excitedly speculates about the fun they will have and the potential to meet the band. In contrast, Marco's response highlights his brooding skepticism as he immediately counters her excitement with a negative outlook. This interaction captures the essence of their personalities and their differing perspectives, reinforcing the contrast between Sadie's positivity and Marco's cynicism.