The main purpose of the novel is that its exaggerated and portrayed of the struggles of African-American communities in Oklahoma during the 1930s.
In Oklahoma, the great dust storm of Oklahoma happened in 1930 and made the weather threw up so much dirt that results to zero visibility .
Hence, the main purpose of the novel is that its exaggerated and portrayed of the struggles of African-American communities in Oklahoma during the 1930s.
Therefore, the Option B is correct.
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