The answer is a.
The Populist Party was originally formed by farmers in response to the growing threat big companies had on them. So that rules out b through d.
If you want me to give you a more detailed explanation of the Populist Party, let me know because I just had a final on this in college. :)
Answer:that's really hard, lemme try
Go to essaytyper (lol its not a link)
Explanation: