Which trait is used to evaluate the mood created by the writer?
B. Word choice.
Word choice is the trait through which a writer can evoke mood, tone, and atmosphere. The words that the writer chooses are essential to portray the desired feelings and reactions.
For example, check this passage from Edgar Allan Poe's "The Fall of the House of Usher": "During the whole of a dull, dark, and soundless day in the autumn of the year, when the clouds hung oppressively low in the heavens, I had been passing alone, on horseback, through a singularly dreary tract of country..."
All the underlined words are meticulously chosen to create a gloomy mood, and Poe succeeds in provoking the reader a sense of mystery and melancholy.