The correct answer is B. It stopped the Germans from advancing further into Russia.
The surrender of German forces at Stalingrad in February 1943 marked a crucial turning point in World War II on the Eastern Front. This defeat halted the German advance into the Soviet Union and began a series of Soviet offensives that would eventually drive the Germans back towards Germany. The loss at Stalingrad not only had significant strategic implications but also boosted the morale of the Soviet forces and their allies.