Trench warfare caused a stalemate on the Western Front. Thus the correct answer is C.
What was trench warfare?
Trench warfare is a form of land combat that uses occupied lines primarily made up of military tunnels. Soldiers are quite well from the small explosions from the enemy and are mostly protected from artillery attacks.
On the Western Front, trench warfare resulted in a stalemate. The most recent developments in defensive weaponry in battles where both sides had produced destructive armament.
Therefore, option C is appropriate.
Learn more about the Western Front, here:
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