How Did Dr

How did Dr. Semmelweis determine that childbed fever was actually caused by a germ or microorganism?

A) Process of elimination. He experimented with every other possibility and that was all that was left that worked as an explanation.
B) He accidently stabbed a woman with a scalpel during childbirth, and she ended up dying of childbed fever.
C) He identified the bacteria in a blood sample from a woman who had died of childbed fever.
D) A midwife who had somehow figured it out pointed him in the right direction.
E) A colleague accidently stabbed himself with a scalpel during the autopsy of a woman who'd died of childbed fever, and he subsequently died of the fever.