You Ask the Butcher to Grind a Sirloin Roast to Be

You ask the butcher to grind a sirloin roast to be used for hamburger. You family likes hamburgers rare, so you undercook the meat. Unfortunately, within two days they develop the symptoms of gastrointestinal disease: diarrhea, bloating, and vomiting. Which of the following statements best
Describes what happened?

A) The meat grinder was contaminated, and bacteria were transferred and distributed throughout the meat.
B) The meat became contaminated by bacteria from other foods in your refrigerator.
C) The meat became contaminated by bacteria on the barbeque grill, coating both sides of the hamburger patties.
D) The animal was sick before slaughter, and the sirloin was contaminated.