Answer: D) Provide for a defense pact against possible Soviet aggression.
Explanation: After the gradual withdrawal of the allies from the Second World War, the Soviet Union from one and Western allies on the other hand, threatened the spread of Communism. Instead of holding democratic elections in Eastern European states, Stalin imposed communism for the so-called World Communist Revolution. This with the Western allies caused certain fear and precaution against such Stalin's policy, and the military alliance of the Western allies - NATO was founded. Although the original purpose of forming the NATO alliance was a military alliance in order to prevent any possible Soviet aggression, nowadays NATO also takes part in assisting countries where, for example, natural disasters have occurred, and so on.