Which of these terms is defined as the feeling (happiness sadness somberness) reader gets from a literary work?

The feeling a reader gets from a literary work is called mood.

Here's why the other options aren't quite right:

* Happiness, sadness, somberness are examples of *emotions* a reader might experience, but they don't describe the overall feeling or atmosphere of the work.

* Tone refers to the author's attitude towards the subject matter, which can influence the mood but isn't the same thing.

Mood is the overall atmosphere or feeling that the author creates through their writing. It's a broader concept than individual emotions.