Choose the sentence in this excerpt that explains why United States involvement in World War I was significant.
A) By late spring 1918, however, hundreds of thousands of Americans arrived in Europe.
B) The bulk of the U.S. troops fought in their first major battle of the war, at Cantigny in France, in May 1918.
C) With the help of fresh U.S. troops, the Allies turned the tide against Germany on the Western Front.
D) By that fall, all the Central Powers sought an end to the conflict.