German defenses at the battle of the argonne forest crumbed under the assault of

The American Troops had ruined finished German defenses, and opened a hold on the eastern flank of the German lines. Soon after the Germans began to retreat and this was the end of WW1. The Germans inflicted many casualties on the American troops, but by early November of 1918.  

your answer would be (b)

hhebeueubevcje. he. me. e beben