Question

tone can be described best as
the logic that runs throughout a work or part of a work
the things that are referenced in a work or part of a work
the emotion that pervades a work or part of a work
the rhetorical devices that are used in a work or part of a work

Explanation:

Tone in literature refers to the author's attitude or emotion towards the subject matter. It is not about logic (which would relate more to structure or argumentation), references (which are about content sources), or rhetorical devices (tools of language use). It is specifically about the emotion that pervades a work.

Answer:

the emotion that pervades a work or part of a work