It is a word that connects words, clauses, and sentences.
Motives (a motif)
A motif is a short musical phrase that repeats or reoccurs inside a composition that usually has some sort of importance to the theme or overall meaning of the piece. It's the smallest unit that still contributes to the theme of a composition.
The author's attitude is the tone. This sets up mood, which is the reader's feelings toward the text. I often teach these together because they can be so confusing. Syntax is just the arrangement of words, which is often seen in poetry as this is where it is most effective. Diction is simply the choice of words, which is part of tone but not the full definition of tone. C is the correct answer.