Stalin failed to keep which promise made at the yalta conference

Allowing free elections in Eastern Europe.

Explanation:

The Yalta Conference was a WWII conference of the chief of the allied - President Roosevelt, Winston Churchill, and Joseph Stalin -. During this conference, the future of Poland and Eastern Europe was discussed, also the occupation of Germany.

At the time, the conference was considered successful, but it was marked by the betrail of Stalin after he broke promises not allowing free elections in Eastern Europe and installed governments dominated by the Soviet Union.

most of the knowledge we have of the conflict comes from roman-jewish scholar titus flavius josephus, who first fought in the revolt against the romans, but was then kept by future emperor vespasian as a slave and interpreter.

d. china

good luck

d is the best choice