Well, it would probably have to do with the research on our own opinions, so it would be A).
... because they opposed the United States becoming a member of the League of Nations.
The League of Nations was the signature idea of President Woodrow Wilson, point #14 of his 14 Points, an international peacekeeping association which he recommended for post-war settlements. The Treaty of Versailles adopted that idea, but back home in the United States, there was not support for involving America in any association that could diminish US sovereignty over its own affairs or involve the US again in wars beyond those pertinent to the United States' own national security.
By means of excavations and the study of the areas that lived in as well as the careful study of there remains to study there health and if there where identifiable diseases that they suffered and other things of this nature <span />
Thomas Paine
wrote the pamphlet called common sense