Answer:
B)The western front became a stalemate.
Explanation:
The Western Front of World War I was opened in 1914 after the German Empire's army invaded Belgium and Luxembourg, so it gained military control of important industrial areas of France. The advance of the Empire underwent a dramatic turn after the first battle of the Marne, where the alliance between France and the United Kingdom defeated. Both sides -Aliados and Central Powers- settled in a sinuous line of fortified trenches, which extended from the North Sea to the Swiss border with France. That line remained static for most of the war.
Between 1915 and 1917, major offensives occurred along the front. In the attacks, huge bombardments with artillery and large infantry demonstrations were carried out. The combination of trenches, machine guns, barbed wire and artillery inflicted many casualties on the aggressive and defensive forces. As a result, no significant progress was made. Among the most costly of these offensives were the Battle of Verdun, the Battle of the Somme and the Battle of Passchendaele - with nearly 700,000, 1,000,000 and 600,000 dead respectively. In an effort to dissolve the stalemate, this front allowed the introduction of new war technologies, such as poisonous gas, combat aircraft and tanks. But only after the adoption of improved military tactics did some degree of mobility recover.
Despite the stagnation of this front, this scenario turned out to be of decisive importance. The inexorable advance of the allied armies in 1918 convinced the German commanders that defeat was inevitable, and the government was forced to negotiate the conditions of an armistice.
