Name two new weapons or technologies that emerged prominently in World War I.

• A. Tanks and poison gas
• B. Machine guns and rifles
• C. Naval submarines and battleships
• D. Hot air balloons and signal flares

Answer: (D)

World War I marks a turning point where battlefield technology began to reshape strategy and tactics in a lasting way. The two innovations that stand out are armored tanks and chemical weapons. Tanks were designed to break the grip of trench warfare by crossing difficult terrain, barbed wire, and machine-gun positions, allowing infantry to advance and crack stalemates that traditional foot and horse patrols couldn’t overcome. They represented a shift toward combined arms and mechanized movement, evolving rapidly over the course of the war to support breakthroughs.

Chemical weapons added a whole new dimension to combat, introducing hazards that couldn’t be solved by armor or bullets alone. Gases like chlorine, phosgene, and mustard gas could obscure, injure, or kill exposed troops, compelling changes in protective gear, training, and battlefield tactics. The other options describe technologies that were already in use before World War I or were not unique to the conflict, whereas tanks and chemical weapons defined the era’s distinctive, transformative advances.