What is the author's purpose for including this scene? "I am functioning at such a high level," said Mitty, hurling his dinner tray at Derek, "that you will never attain it."

Derek caught the tray like a frisbee, slung it back and then whipped Mitty with a thermal blanket, accidentally scattering dozens of get-well cards. (page 195)

A.
To show that Mitty is feeling better and good enough for horseplay with his friend.

B.
To show how disrespectful the boys are.

C.
To show just how angry Derek is with Mitty.

D.
It's just an excuse to use the word frisbee in the book.