Final answer:
Option (a), Air warfare was key to the Allies' success as it disrupted German supply lines and weakened their forces, targeting both industrial capacity and civilian morale, ultimately crippling Germany’s war effort.
Step-by-step explanation:
How was air warfare key to the Allies' success in breaking Germany? The correct answer is (a) It disrupted German supply lines and weakened their forces. Air warfare was crucial in crippling Germany's ability to sustain the war effort. Both the Allies and Axis powers recognized that industrial production and supply lines were essential targets in the war. The Allies' strategy included the strategic bombing of German cities, and day and night bombing campaigns aimed at Germany's industrial and military targets.
This relentless air assault on infrastructure, supply chains, and the morale of the German people, such as the bombing of Dresden, played a vital role in destabilizing Germany's war capabilities. Moreover, by depriving U-boats of their strength in the North Atlantic, the Allies were able to secure crucial supply lines and prepare for an invasion. In the context of total war, air power not only provided a strategic advantage but was also a means to decisively weaken the enemy by targeting their capability to fight and sustain their military forces.