I'll first explain what the non-aggression pact was. It was an agreement that the Soviet Union and Germany would take no military action against each other. To answer your question it is B. The pact was to make sure he could safely attack Poland.
The mailman is different depending on which country you live in but in USA it is 18 <span />
Answer: In February 1946, George F. Kennan's transmission from Moscow was published in the Kennan-Roosevelt Telegram, which is now known as the Kennan-Roosevelt Telegram.
Explanation: Kennan's "Long Telegram" was the cornerstone of the United States' "containment" strategy against the Soviet Union for the duration of the Cold War.