Leaders of the Major Nations Involved Based Their Military Planning

Leaders of the major nations involved based their military planning on the assumption that

A) a willingness to engage in brutality would be necessary.
B) victory would entail large-scale casualties and likely take years.
C) the war would move very quickly and be decided by a few key battles.
D) military technology would play a decisive role in victory.
E) trench warfare would require a new style of fighting.