Answer:
Master Sergeant Raul Perez "Roy" Benavidez
Explanation:
Master Sergeant Raul Perez "Roy" Benavidez (August 5, 1935 – November 29, 1998) was a member of the United States Army Special Forces (Studies and Observations Group) and retired United States Army master sergeant who received the Medal of Honor for his valorous actions in combat near Lộc Ninh, South Vietnam.
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,