When the War Became Mired Down in Trench Warfare,the Military

When the war became mired down in trench warfare,the military and civilian leaders of the warring countries

A) launched increasingly large attacks with the goal either a breakthrough or of bleeding the other side into defeat.
B) quickly realized the futility of the war and sued for peace.
C) immediately put the emphasis on new technology (planes, tanks, submarines, etc.) to affect a breakthrough.
D) were replaced by another younger generation of leaders.
E) called a cease fire until the Americans entered the war.