What did the truman doctrine promise?
a. to liberate poland
b. to send aid to all nations threatened by soviet expansion
c. to drop an atomic bomb in the ussr if they did not leave poland
d. to resign the united states from the united nations if the soviet union remained a member

Truman Doctrine promised to send aid to all nations threatened by Soviet expansion. The correct option among all the options given in the question is option "B". The Truman Doctrine actually emerged from a speech in the month of March of year 1947. Truman in his speech declared that the United States of America would help any country that would fight against communist aggression. This policy was also popularly known as the Containment of Communism. Truman was actually afraid that the communists would take over several countries and increase their influence.