What is one reason steinbeck uses parallelism in the grapes of wrath?
to develop his tone
to create a puzzle for the reader to decipher
to downplay the contrast of opposing ideas
to detract from disturbing images

I found another post that is this same question, I copied it for you.

Steinbeck uses parallelism in the Grapes of Wrath because he wanted to emphasize the fact that the people were not happy when the new migrant moves into their neighborhood. He also shows how the migrants form close bonds with each other due to their similar struggles and life experiences. Parallelism is the balance between two or more similar words or phrases. By using parallelism, the author improves his writing style and readability of his novel. Parallel construction also improves the reader's understanding of the story. 

In 2081, everyone is equal not only in the eyes of the law but in every way; nobody is smarter, more athletic, better looking, etc. than anyone else. hazel is of average intelligence, which means she can't think about anything except in short bursts, and george has an intelligence way above normal.