What Influenced the Decision to Halt the Marshall and Warren

Multiple Choice

What influenced the decision to halt the Marshall and Warren demonstration that Helicobacter pylori before all of Koch's postulates were satisfied?

A) Inoculating humans with pathogens in a deliberate manner was a questionable practice
B) The unavailability of any cure for the disease
C) The difficulty culturing the microbe
D) The fact that stopping at the stage reached had always been the documented approach
E) Antibiotic resistance of Helicobacter pylori