Final answer:
The UN supports self-determination because it allows for complete independence and freedom, and it is central to the UN's mission to foster decolonization, democracy, and human rights. The correct answer is option: 3) It will enable people to enjoy complete independence and freedom.
Step-by-step explanation:
According to the UN, the world should support self-determination because it will enable people to enjoy complete independence and freedom. The principle of self-determination is deeply rooted in the UN's mission for decolonization, democracy, and human rights.
The respect for self-determination has led to the significant increase in the number of independent states since the founding of the UN, reflecting the organization's dedication to this value.
Furthermore, the process of decolonization facilitated the emergence of nations from former colonies, advocating for the sovereignty and self-governance that would culminate in their UN membership and the broader representation of independent states globally.