3.why did the populist party support william jennings bryan?

Bryan supported many populist reforms

Explanation:apex

Because of his faith in the wisdom of the common people, he was often called "The Great Commoner". ... A supporter of bimetallism, Bryan was also nominated by the Populist Party and the Silver Republican Party. In the intensely fought 1896 presidential election, Republican nominee William McKinley emerged triumphant.

I'm pretty sure the answer is c.