The correct option is B
Operation Barbarossa undertaken on June 22, 1941, was the code name given by Adolf Hitler to the invasion plan of the Soviet Union by the Axis Forces during the Second World War. This operation opened the Eastern Front, which became the theater of one of the largest operations of the war, scene of the biggest and most brutal battles of the conflict in Europe. The name of the operation is a tribute to Federico I Barbarroja whose name is linked to the German nationalism of the 19th century. Operation Barbarossa was a blow to the unprepared Soviet forces, which suffered heavy losses and lost large tracts of territory in a short time. However, the arrival of the Russian winter ended with the German plans to end the invasion in 1941. During the winter, the Red Army counterattacked and annulled Hitler's hopes of winning the battle of Moscow. The operation ended on December 5, 1941 with the withdrawal of the German army.
