What Was One Example of Empirical Evidence Used by Dr

What was one example of empirical evidence used by Dr. Semmelweis to determine the cause of childbed fever?

A) Women who dealt with doctors and medical students at the hospital were more likely to contract childbed fever.
B) Miasma was thought to cause disease.
C) Women who spent their labor on their sides were less likely to contract childbed fever.
D) Stopping all autopsies stopped the incidences of childbed fever.
E) Medical students were too rough on women in labor.