The primary source would be the novel "Tender is the Night by Fitzgerald."
Its A. i checked on a test and it was right.
This excerpt is mainly talking about how other powers want to be dominant- and the only way to do that is to rise over everyone else. Kennedy is saying that we will be in charge of ourselves and that we do not intend on having an authoritative power attempting to vanquish us.
In conclusion, your final answer should be B.