During world war i, which weapon was most likely to cause unintended deaths?

It depends.  It could be from artillery or from gas.  There are instances where coordinates were miscalculated and that resulted in the bombardment of their own soldiers.  Gas can be another weapon because once it is unleashed anyone can be affected if they don’t wear their gas mask.

answer; (d) i believe that the correct answer is americans finally ran out of ammunition;