In general, the Populist Party argued for decreased prices in food and farm products because that would mean less income for the farmers, who supported them.
I believe it would be c. Reasoning Stained glass windows were once used to educate people who could not read. By looking at the painted scenes in the glass, people could learn about the stories of the Bible and religious teachings.
Silk was not only important for just any handy resource to craft or make something useful or important for life but it was mainly in demand due to the fact that it was a significant factor in the development of several cultures. I don't know if this takes your question head on but I hope it helps :)