What is the question here?
"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.
Answer:
C) It incorrectly assumes that popularity equates to moral correctness.
Explanation:
A fallacy is an argument that is not correct but that might persuade people to believe it by appearing to be a good reasoning. According to this, the reasoning is fallacious in this statement because it incorrectly assumes that popularity equates to moral correctness. This is the answer because the statement indicates that as the reality is popular, it is not corrosive and decadent and this is an invalid argument because if a program is popular, this doesn't mean that it is morally correct. However, this may be an argument that people might believe.