Which of the Following Statements Concerning Koch's Postulates Is False

Which of the following statements concerning Koch's postulates is false?

A) All of Koch's postulates must be satisfied before an organism can be proven to cause a particular disease.
B) Koch's postulates involve the experimental infection of susceptible hosts.
C) Koch's postulates cannot be used to demonstrate the cause of all diseases.
D) A suspected pathogen must be found in the majority of individuals with a particular disease.
E) A suspected pathogen must be able to be grown in the laboratory.