Which of the following statements about supranational organizations are true? i. A supranational organization is an effort between three or more nations. ii. Supranational organizations promote cooperation between different countries. iii. Supranational organizations, such as the United Nations, often lead to violent conflicts between members and non-members. A. i. only B. i. and ii. only C. i. and iii. only D. i., ii., and iii.