(A) Sussex Pledge
(B) Espionage Act
(C) ** Unrestricted Submarine Warfare
(D) Schenck v. United States
EXPLANATIONS BELOW
Concept note-1: -Unrestricted submarine warfare was first introduced in World War I in early 1915, when Germany declared the area around the British Isles a war zone, in which all merchant ships, including those from neutral countries, would be attacked by the German navy.