The Answer: is B. Machine Gun
The machine gun was the modern-day revolution in combat and bringing down the enemy's Army of horse-driven carriages during WW1. The machine gun was an American invention. It was the most sought-after weapon in the early 1900s, mostly acquired by the Germans during World War 1 in large numbers.
One gun was capable of shooting multiple bullets through a single trigger making it a highly effective weapon that was widely sought after but also criticized at the same time as it was revolutionizing the war.
The credit of its invention goes to the industrial revolution, the period of inventions of various forms of machinery.
A large number of machine guns were manufactured for the war by the US's Marlin Firearms Company, which incidentally made America also a part of WW1 as a combatant (through war weapon production).
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