Answer:
b. the establishment of a United Nations Organization after the War.
Step-by-step explanation:
The Yalta Conference was a meeting or a conference between the three allies of the World War II, i.e., Prime Minister of Britain, Winston Churchill, Franklin D. Roosevelt, the President of USA and the Soviet Premier Joseph Stalin.
The three heads of the government met on the resort city of Yalta in the year 1945.
At the meeting they discussed the postwar reorganization of Europe and Germany. And they also agreed to established an organization for all the countries of the world to maintain peace and order in the world. Thus, the United Nations was established.
Thus the correct option is (b).