The question asks to identify another significant weapon or technology introduced or widely used during World War I, in addition to poison gas, tanks, and machine guns. We need to evaluate each option based on its historical context and development during WWI.
C) Military submarines (U-boats) — German U-boats were a major new weapon system in World War I, causing immense damage to Allied shipping and becoming a significant strategic threat. Their widespread and effective deployment marked a new era in naval warfare.
The question asks about the historical significance of the Battle of Verdun, specifically what type of warfare it symbolized due to its prolonged nature, high cost, and the primary combatants involved. We need to identify the characteristic form of warfare prevalent on the Western Front during World War I that led to such immense human cost.
Correct Option: D) Attritional trench warfare on the Western Front
The question asks about the historical event that led to a specific country's entry into World War I, triggered by Germany's policy of unrestricted submarine warfare. This requires knowledge of the major events and alliances of WWI.
Correct Option: A) The United States. Germany's policy of unrestricted submarine warfare, particularly its resumption in 1917, directly led to the United States abandoning its neutrality and entering World War I.
The question asks to identify the British passenger liner whose sinking by a German U-boat in 1915 led to the death of American citizens and escalated tensions with the United States. This is a historical event directly related to World War I.
B) RMS Lusitania – The RMS Lusitania was a British ocean liner sunk by a German U-boat on May 7, 1915, off the coast of Ireland. The attack resulted in the deaths of 1,198 people, including 128 American citizens. This act of unrestricted submarine warfare by Germany caused immense international outcry and was a major factor in turning American public opinion against Germany, contributing to the U.S. entry into World War I two years later.
The question asks to identify the secret German diplomatic communication that proposed a military alliance with Mexico, which influenced the United States' entry into World War I in 1917. This requires knowledge of key events and documents related to the US involvement in WWI.
Correct Option: C) Zimmermann Telegram
The question asks to identify the peace treaty signed by Russia with Germany in 1918, following its withdrawal from World War I after the Bolshevik Revolution. This requires knowledge of key treaties signed at the end of or during World War I.
Correct Option: D) Brest-Litovsk