Answer:
D. It narrates the plight of the Dust Bowl victims who were forced to migrate to California during the 1930s.
Step-by-step explanation:
This is the best summary of the reason why The Grapes of Wrath is characteristic of American life in the 1930s. The Grapes of Wrath follows the plight of people from the Midwest who were forced to migrate to look for work. These were usually victims of the Dust Bowl, which was exacerbated due to the Great Depression.