C)Advancements were made in an attempt to counteract the stalemate of trench warfare.
Explanation:
- Instead of horses, the studs of mechanized units and tanks first introduced to the fronts in 1916 began to grow, hoping to change the character of an almost medieval trench warfare.
- A new chapter has opened and will culminate in the famous tank battle of Kursk in 1943.
- It was after many centuries, probably since the Bronze Age, the last war in which horses were killed along with humans.
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