Read the following paragraph carefully and select the best topic sentence from the four possible answers that follow the paragraph.
Modern great leaders or poets have been using simple English words in their speeches or writing. During World War Ⅱ when Hitler was nearly occupying the whole Europe, and many people thought the end of mankind was drawing near, Winston Churchill responded in his ringing words:"Let's fight, by sea, land, and air, with all of our might and with all the strength that God can give us." A tit-for-tat struggle was forged, and Hitler was defeated. And now let's hear what Robert Frost said in his poem THE DEATH OF THE HIRED MAN, "Home is the place where, when you have to go there, they have to take you in." Even more terse words are probably the ten two-letter words by William H Johnson when he described his secret of success,"If it is to be, it is up to me."