Which explains the significance of the Battle of Verdun in World War I?

Question

A. A loss to the Central powers caused Russia, which was not well equipped, to sign a separate peace treaty with Germany.
B. The decisive German victory turned the tide against the Allies until the United States joined the fight.
C. Massive casualties for both the Allied and Central powers, with little change in territory, showed the deadly nature of attrition warfare.
D. The naval battle between Britain and Germany allowed Germany to showcase its U-boats for the first time.
is the answer C?

Answer 1

Yes, C.

Answer 2

c is right