Answer: A: all others countries need to know that we will fight them all at any cost to maintain our liberty
"Let every nation know, whether it wishes us well or ill, that we shall pay any price, any burden, meet any hardship, support any friend, oppose any foe, to assure the survival and the success of liberty"
In those lines/ sentences it talks about doing anything for liberty and letter A fits that perfectly
I don't speak much english so I hoped that helped :)