During World War I,the New Technologies of Warfare

During World War I,the new technologies of warfare

A) allowed the attack of the enemy without direct combat.
B) created logistical supply problems, which slowed many offensives.
C) All these answers are correct.
D) were largely responsible for the appalling level of casualties.
E) both created logistical problems, which slowed many offensives, and allowed the attack of the enemy without direct combat.