The legacy of the league of nations was that

it provided aid to war victims.
it served as a model for the un.
all the nations of the world joined.
the united states served as the leader nation.

The correct answer is it served as a model for the UN.

Explanation:

The United Nations (UN), is an organization that is in charge of developing good relationships between nations as a way to keep international peace. The United Nations tries to achieve cooperation between nations and in this way, allows them to take good actions in many social aspects. It is considered the most powerful organization in terms of inter-government around the world.

It was created after World War II as a way to avoid more wars and it succeeded the League of Nations which had not a lot of influence at that time. However, the UN inherited some organizations as well as agencies that had been established by the League of Nations.  

it is a because im a fod nigba

i believe your answer is d)