Answer:
Before Operation Barbarossa, Germany and the Soviet Union were convenient allies (B).
Explanation:
Operation Barbarossa was the code name for the invasion of the Soviet Union during World War II. Nazi Germany wanted to conquer the western Soviet Union so Germans could populate it, for slave labor, and for resources. However, the two years prior to the invasion Germany and the Soviet Union signed political and economic pacts with one another. This was for strategic purposes for the Germans so that they could invade. That's what made the Soviet Union a convenient ally for the Germans.
