Answer:
C) Germany was stopped in the west for the first time in the war.
Explanation:
Until the Battle of Britain, the German army had successfully advanced without a single defeat in Western Europe, with the Blitzkrieg - the innovative tactics combining the overwhelming use of tanks, artillery and the air force with the advance of the infantry, a whole new way to wage war - , proving to be irresistible. To attack Britain, Hitler could not use Blitzkrieg; he first had to achieve air supremacy before invading Britain by sea and air. The British Royal Force with all its brave pilots from Britan and allied countries, stopped the Lufftwaffe´s push to gain supremacy over the skies. Hitler´s push was halted.