Question

Which word or phrase most clearly makes a tone inappropriate for the setting

Answer 1

In the sentence

The story's premise was weak because the plot was a joke and the characters  struck a false note.

The word Joke makes the tone inappropriate for a class presentation

But if its a different one I don't know because you did not list the question

Answer 2

Can you give me the options. If you do, I will answer your question. :)