Question

As a result of isolationist desires, U.S. Congress __________ the charter to the League of Nations.

Answer 1

The answer is they "refused to ratify". 
The League of Nations charter became part of the Treaty of Versailles following World War I. President Woodrow Wilson pushed hard for its passing, to the point that he earned the 1919 Nobel Peace Prize. However, when he brought the charter to the U.S. Congress, the members refused to ratify it. Thus, the international organization promoted by President Wilson never became a part of American politics.

Answer 2

The choices are 
signed and ratifiedwroterefused to ratifyhesitantly presented