Answer: D. Phrases such as "didn't laugh" and "heads down" convey sadness toward the farmers being driven from their land.
Step-by-step explanation: The tone of a poem, sentence or story is the author's or speaker's attitude towards the audience, the subject or even the characters of the text. There are many different kinds of tones; happy, sad, positive, negative, angry, ets. In the given excerpt from "The Grapes of Wrath" we can see that the author uses phrases such as "didn't laugh" and "heads down" convey sadness toward the farmers being driven from their land.