4 would be right from what i've read.
For the answer to the <em>questions</em> above<u><em>, </em></u><span><u><em>Sobel has known sorrow </em></u><u><em>because</em></u><u><em> he is a survivor who came from Poland. He is a Jewish refugee from Hitler's concentration camps. Feld sees Sobel as a life of hardship which he hopes for </em></u><u><em>avoiding</em></u><u><em> for his daughter, Miriam.</em></u></span>
Answer:
O any invading military force
Explanation:
After the Soviet Union lost twenty million soldiers in WW2, Stalin wanted to make buffer zones around friendly states so they would never be invaded again.