John Steinbeck's the Grapes of Wrath Chronicled the Lives of Which

John Steinbeck's The Grapes of Wrath chronicled the lives of which of the following groups, as they were affected by the Great Depression?

A) Pennsylvania Coal Miners
B) Migrant farm workers from Mexico
C) Women and children who had worked in Massachusetts silk mills
D) Dust Bowl farmers who were forced to leave their homes, farms, and, therefore, livelihoods.