What Did George Kennan Argue in His Long Telegram from Moscow

What did George Kennan argue in his long telegram from Moscow?

A) that conflict with the Soviet Union was inevitable, so the United States had to pursue a firm policy of containing Soviet expansion.
B) that the focus of world communism was shifting to China, and the United States should abandon its preoccupation with affairs in Eastern Europe.
C) that American war aims in Europe had been achieved, so the United States should withdraw and focus on domestic challenges.
D) that the Soviet Union was interested mainly in securing its borders, so the United States should encourage its domination of Eastern Europe.
E) that conflict with the Soviet Union was inevitable, so the United States should, if at all possible, invade Russia and halt its expansive tendencies.