Which one if the following statements best describes the war by 1916?

By 1916, World War I had evolved into a grueling stalemate characterized by trench warfare, particularly on the Western Front, where both the Allies and Central Powers suffered heavy casualties without significant territorial gains. The war had become a test of endurance, with major battles like the Somme and Verdun highlighting the human cost of attrition. Political and military leaders were increasingly aware that a quick resolution was unlikely, leading to prolonged conflict and a shift in strategies. Overall, the war by this point was defined by its brutality and the deepening impact on participating nations.