Which line of dialogue shows Maisy as an antagonist?

A "If I were you, Joshua, I would not take my warning lightly," Maisy said.

B "I'm on my way over to help you study for your math test," said Maisy.

C "You know what, Joshua? Things may not turn out as badly as you think," Maisy said.

D "Why can't we just be friends and forget our argument, Joshua?" Maisy said.