Final answer:
The phrase 'letters like smoke' is a simile because it compares letters to smoke using the word 'like'.
Step-by-step explanation:
A simile is a figure of speech that compares two things using the words 'like' or 'as'. In the given options, the phrase 'letters like smoke' is a simile because it directly compares letters to smoke using the word 'like'. The phrase suggests that the letters rise and disappear, just like smoke does. This comparison helps create a vivid image in the reader's mind.
Learn more about Similes