During World War I,American Ground Troops

During World War I,American ground troops

A) saw combat that was relatively brief but intense.
B) were assigned to serve under the command of foreign officers.
C) were not available for battle in significant numbers until the fall of 1918.
D) both saw combat that was relatively brief but insane,and were assigned to serve under the command of foreign officers.
E) None of these answers is correct.