Answer:
C. Chemical weapons.
Explanation:
TL:DR Chemical gas is a war crime due to the amount of suffering it causes. Mustard gas burns the skin, Phosgene is impossible to see, and Chlorine can make you drown in your own body.
Machine guns had been in use and invented since 1908, with invention of weapons such as the Vickers and German Maschinegewehr 08. Trench warfare wasn't a weapon, but more of a tactic. Mines weren't a war crime either as they most likely weren't deemed to cause "unneeded suffering" and their purpose usually was to simply discourage the travel of an area. Usually, if you stepped on a mine you'd die.
Meanwhile, Chemical gas was simply invented on accident as the German Empire's scientist,
<span>The answer is the </span>Netherlands
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<span> When a new innovation hits a country it is a great shock, especially when it is something so abnormally positive. The railroad was one of those innovative milestones in the history of the human imagination... </span>
<span>And so the British government official, who would most definitely be highly educated, would probably be in an excited and optimistic state of mind, because he's witnessing such a cool thing. So he would be confident in the material he is talking about and persuasive to the nonindustrial country.</span>
