Steinbeck include intercalary chapters in the grapes of wrath because to tell a bigger story Option(a) is correct.
Grape of wrath is known to be as the American novel which is basically written by the novelist John Steinbeck and which was published in 1939.
The Grape of wrath was the story which was set around during the period of the Great Depression which focus on the Joad which was known to be as the poor family of the tenant farmers driven actually from their city of Oklahoma Steinbeck idea was generally to tell a bigger story he actually experienced the devastation of the migrants.
Therefore Option(a) is correct.
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