Answer:
The American's Navy and Strategical Force
Explanation:
The significance of military action in WWII is that without taking this necessary action, (assuming you are referring to the U.S.) WWII could have had a very different outcome. The U.S. involvement in WWII was the cause of the bombing of Pearl Harbor. If they hadn't formed the Allied Forces to defeat Germany and Hitler, Germany very well might have won.
The answer to this question is most likely B or C
The Munich Agreement allowed territory belonging to Czechoslovakia around the borders of Germany (where many Germans already were located) to be annexed to form what the Germans called "Sudetenland".
Answer: A