Final answer:
C. Jane Addams opposed U.S. imperialism due to her belief in non-intervention, diplomacy, and concerns about the negative consequences of empire building.
Step-by-step explanation:
C. Jane Addams opposed U.S. imperialism because she believed in the principles of non-intervention and diplomacy.
She felt that empire building went against the principles of democracy and freedom upon which the country was founded. Additionally, Jane Addams held the xenophobic viewpoint that the assimilation of other races would hurt the country.