During WWII Some American Archeologists Volunteered Their Services in the War

During WWII some American archeologists volunteered their services in the war effort.

A) Several collaborated on "national character" studies that tried to characterize peoples who were either allies or enemies.
B) Ruth Benedict provided information that would ultimately prove critical for Allied forces occupying Japan during the prewar period.
C) The Human Terrain Team helped military see situations from an indigenous perspective.
D) They volunteered as servicemen and women, not as archaeologists.