Which of the following describes the comparison of the migrants' anger to a "fermenting" vintage of grapes in the novel? A. Personification
B. Literary allusion
C. Epistrophe
D. Extended metaphor

D. Extended metaphor

Explanation:

"Grapes of Wrath" is the story that reflects the life of a poor farmer family living in Oklahoma. The story carries an extended metaphor as the process of fermentation of grapes has been compared with the increase in anger and frustration of the family. This anger was the result of continuous oppression and inequality faced by the family. The author had brought into light the duration of harvest of the grapes and had compared it with the level of frustration the family has been carrying. In the story the anger and the frustration of the migrants have been compared with the process of fermentation an ripening of the grapes.