This map was published in 1919: A map image of Western Europe is shown. The map focuses on England, Scotland, and Ireland, but it shows the coast of France, Germany, and Norway. The map key notes that the shaded portion on the map indicates the war zone proclaimed by Germany on February 18, 1915. The shaded portion surrounds Ireland, Scotland, and England and extends out from the coast of France and Germany. The sinking of several ships in 1915 is noted on the map. These ships fall within the shaded portion on the map. Public Domain What does this map suggest about Germany's justification for its policy of unrestricted submarine warfare? (3 points)

A. The ships it had attacked were in the war zone.
B. The ships it had attacked were in international waters.
C. The ships it had attacked had crossed the English Channel.
D. The ships it had attacked had refused to follow wartime safe routes.