She might not be telling her dad that she is getting them wrong or is making simple mistakes and another could be that she is turning her work in late.
The answer for the given question above would be option D. Steinback's primary purpose for writing The Grapes of Wrath is to show how one family's struggle was representative of many others. He wrote this in order to show the poor working and living condition of California's migrant workers in the 1930s.
