Populist believed that bankers, land owners, and political parties worked together to keep control of the US in the hands of the wealthy. Therefore last option is correct.
A person, particularly a politician, who makes an effort to connect with the common people who believe that established elite organizations ignore their issues is known as Populist.
The complete question is attached below.
Populists held the view that political parties, banks, and landowners conspired to retain power in the US in the hands of the wealthy.
Therefore last option is correct.
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