Do you mind showing us the passage so we can help
Although this word was made up in order to be a contender for the longest word in English, it can be broken down into smaller chunks in order to understand it.
Anti- means that you are against something; monopoly means the exclusive control over something; geographic is related to geography; and the remaining part has to do with nationalism.
So this word means something like 'a nationalistic feeling of being against geographic monopoly,' but you can see that it doesn't have much sense.
It had something to do with the medals. Nick was given a medal only because he was an
American. The other Italians put their
lives on the line and that is why they got their medals but it is not just getting
a medal but how you earn it by being brave in battle. Nick felt he did not earn his and feels
alienated as a result.
I believe it is A the first one