The History and Development of Epidemiology Has Gone Through Several

The history and development of epidemiology has gone through several developmental phases. The public health nursing student learns that these phases came about in history in what order?

A) Risk factor phase, infectious disease phase, and sanitary phase
B) Infectious disease phase, risk factor phase, and sanitary phase
C) Sanitary phase, infectious disease phase, and risk factor phase
D) Agent phase, host phase, and environment phase