Which statement describes the writings of John Steinbeck?
a.He wrote books glorifying the opulent lifestyles of the rich during the Roaring Twenties.
b.He wrote books centered on themes exploring social values in the South.
c.He wrote books exploring the themes of gender and race as part of the Harlem Renaissance.
d.He wrote books exposing injustice and hardships during times of crisis such as the Dust Bowl.