Answer:
C. Joint operations between the Allies drove the Germans out of the occupied territories.
Explanation:
In Africa the Americans learned that the Germans were still fighting well and hard. After the Germans and Italians were pushed out of Africa
The invasion of Sicily in 1943 affected Hitler's thinking as he called off the faltering German Summer Offensive in Russia to move SS Armored divisions to Northern Italy to backstop the defense.
This created an avenue for the allied forces leading to the success of them in their sorjourn in North Africa.