(A) ** Germany launched a major assault on the Western Front.
(B) Russia joined the Central Powers.
(C) the Battle of Gallipoli (near Turkey) began.
(D) the assassination of the Archduke occurred in Sarajevo.
EXPLANATIONS BELOW
Concept note-1: -On March 21, 1918, near the Somme River in France, the German army launches its first major offensive on the Western Front in two years. At the beginning of 1918, Germany’s position on the battlefields of Europe looked extremely strong.
Concept note-2: -In 1918, a series of major German and Allied offensives broke the stalemate of trench warfare on the Western Front, resulting in the near-collapse of the German Army and the end of the fighting before the end of the year.
Concept note-3: -The Versailles Treaty forced Germany to give up territory to Belgium, Czechoslovakia and Poland, return Alsace and Lorraine to France and cede all of its overseas colonies in China, Pacific and Africa to the Allied nations.
Concept note-4: -The Molotov–Ribbentrop Pact was a non-aggression pact between Nazi Germany and the Soviet Union that enabled those powers to partition Eastern Europe between them.
Concept note-5: -The Battle of the Bulge, also known as the Ardennes Offensive, was the last major German offensive campaign on the Western Front during World War II. The battle lasted for five weeks from 16 December 1944 to 28 January 1945, towards the end of the war in Europe.