Respuesta :
The correct answer is B) They worried about having to take part in future wars.
The reason why the US Senate refused to let the United States join the League of Nations was that they worried about having to take part in future wars.
Although United States President Woodrow Wilson at first was a supporter of the creation of the League of Nations, in the end, accepted the idea of not participating in the League because the federal government believed that a neutral position was the best for America. They wanted to remain neutral as part of its foreign policy. The League of Nations was formed with European Countries and was the first step to later form the United Nations (UN).