Based on the passage about Louis Pasteur, which statement is a fact?

A.
Louis Pasteur was clever when he decided to inject nerve tissue from sick animals into healthy animals.

B.
Louis Pasteur knew it took about a month for signs of rabies to show up in a victim.

C.
Louis Pasteur was one of the greatest scientists who ever lived.

D.
Louis Pasteur should have studied his laboratory animals more closely.