What successful strategy of the allied forces broke the advantage of the German U-boats?

A) The United States entered the war and provided convoys for all merchant vessels.
B) The use of centimetric radar changed the game plan against the U-boats.
C) The added dimension of the development of depth charges that were indeed more accurate than when they were first introduced in 1916
D) The allies established better mine fields in the English Channel and North Sea to thwart the U-Boats.
E) The allied forces began firing upon U-boats and sinking them without warning them first.


A

History

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