A major difference to me would just be that a federalist supports government systems and unites states while the antifederalists do the complete opposite of that.
If the store owner is a Japanese American the best answer is A. He is making a statement that he is American just like everyone else and that even though he is of Japanese herriatage he did not commit crimes towards Americans at Pearl Harbor.
Even if the storeowner is not Japanese American it could be used to show solidarity with the Japanese Americans.
I think its C since he was the only candidate that wasn't known in Washington.
The Answer Is.....
C- Hijrah.