Answer:
Being a good listener.
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Nationalism is best described as A.) A POLITICAL BELIEF THAT A NATION SHOULD HAVE THE RIGHT TO RUN ITS OWN AFFAIRS AND NOT BE RULED BY ANOTHER POWER.
Nationalism is a strong belief held by people of the nation that the interests of a certain nation-state are of primary importance. It includes the belief that people who share the same culture, language, and history should become an independent nation and be free from foreign dominion.
"Let every nation know, whether it wishes us well or ill, that we shall pay any price, bear any burden, meet any hardship, support any friend, oppose any foe to assure the survival and the success of liberty." (A) contains a hyperbole.
In literature, a hyperbole is a stylistic exaggeration. It is used to give a dramatic effect to a statement.
Here, the hyperbole is: "pay any price, bear any burden, meet any hardship, support any friend, oppose any foe." There are of course prices that the U.S. are going to refuse to pay, burdens they will not afford to carry, etc., but by exaggerating these commitments, Kennedy sounds more resolute and more persuasive.