Picking a Nice Sirloin Roast,you Ask the Meat Manager to Grind

Picking a nice sirloin roast,you ask the meat manager to grind it up into ground beef,to be used for hamburger meat.Since your husband likes his hamburgers rare,you undercooked the meat just as he likes it.Unfortunately,within 2 days he develops the signs and symptoms of gastrointestinal disease--diarrhea,bloating,and vomiting.Which of the following statements best describes what might have happened?

A) The meat grinder was not cleaned well with disinfectant.When the sirloin was ground up with the grinder,bacteria were transferred to the meat and thoroughly distributed throughout the meat.
B) The sirloin was already contaminated when it was in the whole animal,probably due to the animal being sick.
C) The hamburger meat became contaminated by bacteria that were in other foods in your refrigerator.
D) The meat became contaminated by bacteria on the barbeque grill,coating both sides of the hamburger patties.