B. People need to welcome the job of defending freedom.
One of the purposes of Kennedy's speech was to encourage and inspire people to take actions to defend their freedom, in unity, as a society. This is clear when he said:
"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."
"My fellow citizens of the world: ask not what America will do for you, but what together we can do for the freedom of man."