Which of the following best describes the system of trench warfare that developed on the Western Front?

A. Digging trenches helped establish a fast-paced war that favored aggressive tactics.
B. Digging trenches helped eliminate the area on the battlefield known as "no-man's-land."
C. New technologies like machine guns favored defensive tactics and protective trenches.
D. Trenches helped each side mark new positions as the territory on the Western Front pushed into Germany.