By 1917 the war on the Eastern Front
a. had developed into trench warfare similar to the Western Front.
b. was resolved by a peace treaty between the combatants.
c. had stagnated into a stalemate in which neither side had an advantage.
d. resulted in a massive Russian offensive fueled by the numerical superiority of Russian armies.
e. led to a major revolution in Russia that toppled the tsarist government.
Answer: E