Question

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

Answer 1

Going on

Step-by-step explanation:

It doesn't fit the theme of all the other options as it could be replaced with a more proper sounding phrase such as "on going", just as an example.

Hope this helps!

Answer 2

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