Which of the following statements best describes the impact of trench warfare during
World War I?
A. It resulted in huge territories changing hands rapidly as a result of
successful invasions.
B. It coordinated the efforts of military forces using air, land, and sea to deadly
effect.
C. It resulted in a stalemate that prevented any side from gaining an
advantage.
D. It brought warfare into civilian areas, resulting in unintended casualties.