All of the following were part of the Populist Party's program except

Aa flat income tax—everyone pays the same rate or percentage
Bdirect election of U.S. senators by the people, not by state legislatures
Cprotection against consumer fraud
Dmore government loans for farmers

Verified Answer :

All of the following were part of the Populist Party's program except "a. a flat income tax—everyone pays the same rate or percentage," since the Progressives were in favor of a "Progressive Tax" system that would have taxed higher earners more heavily. 

the answer is A. a flat income tax-everyone pays the same rate or percentage