Which of the following was most responsible for sparking the populist movement in Oklahoma?A.Although agricultural production was increasing and costs were declining, farmers were not enjoying a rise in their standard of living.B.American imperialism had resulted in territorial expansion in Alaska, Hawaii, and the Pacific.C.Urban factory owners began to crack down on unionization in the nation’s factories.D.Strikes, such as the Great Railroad Strike of 1877, had failed to create meaningful change.