The correct answer is "The tactic's reliance on speed and surprise led Germany to great success in the early years of the war."
"Blitzkrieg" was a warfare method created by the Nazi Regime during the early stages of the Second World War. It consisted of assigning a dense concentration of armored and motorized units into the front part while attempting to break on an opponent's line of defense. This group was covered by air support. The result was the rapid dislocation of the defenders, which saw themselves circled by enemy units in the ground and by air. This technique let the Germans take rapid control of countries like Poland.