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The march of the German Army seem inhuman because in rally Germany became aggressive and attacked France that results huge loss of arm forces and general public.
Explanation:
The march of German army headed through Brussels during 1915. In its rally Germany attacked France and for that invaded Belgium who was not in rally or did not have any other relation with Germany. The neutral Belgium suffered for the untimely unwanted invasion of Germany.
For this invasion Belgium lost its force and general citizens. Germanies used Belgium's citizen for their interest, for attacking into well planned way to France. For this reason the march of Germany considered as inhuman as they behaved brutally.
B is the answer to your question
