Questions: NOTICE! Travelers intending to embark on the Atlantic voyage are reminded that a state of war exists between Germany and her allies and Great Britain and her allies; that the zone of war includes the waters adjacent to the British Isles: that, in accordance with formal notice given by the Imperial German Government, vessels flying the flag of Great Britain, or any of her allies, are liable to destruction in those waters and that travelers sailing in the war zone on ships of Great Britain or her allies do so at their own risk. IMPERIAL, GERMAN EMBASSY, Washington, D. C., April 22, 1915. Source: New York Times, May 1, 1915 (adapted) Which technological innovation of World War I is most closely associated with this German notice? A) tanks B) airplanes C) submarines D) machine guns 9. The immediate cause of World War I was the A) assassination of Archduke Ferdinand B) Japanese alliance with Germany C) treaty agreement at Versailles D) German invasion of Poland

The answer is C) submarines

Tanks were indeed a significant technological innovation during World War I, but they are not specifically associated with a German notice. Tanks were primarily developed and used by the British and French forces to break through trench warfare.

Airplanes were used for reconnaissance and later for combat during World War I. However, they are not typically associated with a specific German notice.

Submarines, particularly German U-boats, are most closely associated with World War I notices. Germany used U-boats to enforce a naval blockade against the Allies, and they were infamous for their unrestricted submarine warfare, which included the sinking of civilian ships.

Machine guns were a crucial part of World War I warfare, contributing to the stalemate of trench warfare. However, they are not specifically linked to a German notice.

The answer is A) assassination of Archduke Ferdinand

The assassination of Archduke Franz Ferdinand of Austria-Hungary in Sarajevo on June 28, 1914, is widely recognized as the immediate cause that triggered World War I. This event set off a chain reaction of alliances and mobilizations leading to the war.

Japan was actually aligned with the Allies during World War I, not with Germany. This option is incorrect.

The Treaty of Versailles was signed after World War I ended in 1919. It was not a cause of the war but rather a peace settlement.

The German invasion of Poland occurred in 1939 and was the immediate cause of World War II, not World War I.