Option A is the correct response to the stated statement. To support William Jennings Bryan, they teamed up with the Democrats.
The Populist Party was founded by farmers who were dissatisfied with the Democratic and Republican parties. The Populists felt that the federal government should regulate numerous enterprises, particularly railways, in order to take a more active role in the American economy.
Thus, the populist party's involvement in the presidential election was that they allied with the Democrats to gain support.
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