The only way women could serve in the army during world war one was as?

It would be nurses (B). Women in World War I could only serve in the Army as nurses.  

EXPLANATION:  

Women were deployed on all fields in massive numbers during World War I. The great majority of these women were recruited into the civilian labor force to replace enlisted men and serve in large-scale factories producing weapons. Others served in specialist roles in the army, e.g. as nurses, but some also saw the war in Russia.

During the battle, there were 21,498 U.S. Army nurses (then all American military nurses were women) worked in the U.S. and overseas military hospitals. Many of these women were placed near battlefields, tending to over a million soldiers who were injured and unwell. There were 272 The United States Nurses of the military who died of illness (mainly tuberculosis, influenza, and pneumonia).

Eighteen nurses from the African-American Army handled the treatment of German prisoners of war and African-American soldiers on the stateside. They were delegated to Camp Sherman, OH, and Camp Grant, IL, and stayed in different quarters. What happened to US women during World War I also happened in other countries. Women from many countries served as nurses during World War I. For examples are women in Great Britain who helped injured soldiers during the war and women in Australia who inv

i am sure the answer is d