How was war on the western and eastern fronts different? how was it the same?

The war in the eastern and western front was the same in the sense that both fronts used similar or even the same tactics as at the time of the war, this was the only way how war was being done. On both fronts, there were immense artilery shellings going on together with huge loss of life. However, in the eastern front, one has to add the horrible conditions - extreme cold, rain, winter, etc. to this. 

It is c because it shows how the author is stating their own oppinion about the protagonist