What long-term impact did the fighting shown on this map have on the war in europe? it opened up a second front in europe, as stalin had requested. it brought the soviet union into the war. it set the stage for mussolini's fall from power. it led to the final defeat of germany.

Okay, so I actually did a lesson on this a few months ago. The answer is A.
If you want proof, just look at the matter of facts. It's not B because the Soviet Union was already in the war when this happened. Mussolini didn't fall from this, nor was Germany defeated. Instead, it marked a turning point in the war.