【单选题】Before the 1870's, trained nurses were virtually unknown in the United States. Hospital nursing was an unskilled occupation, taken up by women of the lower classes, some of whom were conscripted from ...
A.
Public Hygiene in the United States.
B.
Florence Nightingale: A Nurse's Story.
C.
The Fight for Nursing Education in the United States.
D.
Health Care in Upper-Class and Lower-Class Neighborhoods.