The best and most correct answer among the choices provided by the question is the second choice, modeling social behavior for all classes.
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Why it was almost impossible for one party to win a majority because the candidate(s) were represented by north or south. Most south obviously didn’t vote for the north and vice Versa. Since the majority was 50/50 or very close it was almost impossible for one party to win a majority. (You can copy this i didn’t use a website)