Which of the following statements best describes the impact of trench
warfare during world war i?
o
a. it brought warfare into civilian areas, resulting in unintended
casualties.
o
b. it coordinated the efforts of military forces using air, land, and sea
to deadly effect
o
c. it resulted in huge territories changing hands rapidly as a result of
successful invasions.
o
d. it resulted in a stalemate that prevented any side from gaining an
advantage.