The World War I battle being described is A) Verdun.
Step-by-step explanation:
The description matches the characteristics of the Battle of Verdun, which took place between February and December 1916. It was the longest and one of the most devastating battles of World War I, resulting in more than a quarter of a million battlefield deaths and at least half a million wounded. It was fought between German and French forces and saw a total of about 40 million artillery shells exchanged by both sides, which left behind an endless field of shell craters still partly visible today. The other battles listed, such as the First Battle of the Marne, the Somme, and the Ardennes Forest, do not match the description provided.