Ineed on this its for my mws quiz in my k12 mws class which of the following was not a new weapon or new method of warfare used during world war i u-boats airplanes poison gas artillery

ARTILLERY, has been used in warfare for centuries in many different conflicts. U-boats were submarines and were used in previous conflicts but I think it means the German subs specifically.

D.I think artillery.

to protest slavery i would think it would be a