The most accurate response is:
A
The United States did not want to get involved in European conflicts.
Despite President Wilson's proposal for the League of Nations as part of his Fourteen Points, there was significant opposition in the U.S. Senate, particularly from those who believed that joining the League would entangle the United States in European affairs and conflicts. This sentiment ultimately led to the U.S. not ratifying the Treaty of Versailles, which included the League of Nations.