As per the arguments, it is to be believed that the poor Americans are to be left out of the interest group system.
Who are poor Americans?
The set of American population that earns below the annual prescribed limit as per the laws is considered to be poor.
Interest group system has been formulated in the society for the purpose of influencing the government and Congress to hear the grievances of these groups.
Poor Americans have been kept out of the part of this group system, as the authorities have deemed fit to do so.
Hence, option B; poor Americans have been a part of the argument to be left out of the interest group system in the United States of America.
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