Answer:
B. referendums
Step-by-step explanation:
Progressivism was a movement that lasted between 1896 and 1916 that aimed to create solutions to the problems that urbanization, industrialization, and corruption brought to society.
Because of that Progressivism was built by many activists and leaders of movements such as labor movements, women’s rights movements, environmentalism, anti-war and gay rights.
The referendum was a measure that was proposed by progressivists but it was not a part of their social justice agenda, it was a part of anti-corruption and political participant agenda.