Which term describes the word choices made by a writer?

The term that describes the word choices made by a writer is diction. Diction refers to the specific vocabulary and phrasing a writer uses in their work, which can convey meaning, create mood, and develop character. It encompasses the level of formality and the emotional weight of the words selected. Writers often choose their diction carefully to align with their purpose and to shape the reader's perception of the text.

In contrast, syntax refers to the arrangement of words and phrases to create sentences, affecting how meaning is conveyed but not specifically focused on individual word choices. Tone is the attitude of the writer toward the subject or audience, expressed through diction and syntax but not exclusively defined by one. Style encompasses the overall manner of expression in writing, which includes but is not limited to diction. Therefore, of all the options, diction most accurately identifies the focus on word choice alone.