Franco Made Dinner for His Roommates

Franco made dinner for his roommates. The meal included a baked cut-up chicken, fruit salad, and stir-fried rice with mixed vegetables. About 8 hours after eating dinner, Franco and his roommates experienced nausea, vomiting, fever, chills, and diarrhea. Based on this information, Franco probably

A) allowed the frozen vegetables to thaw before adding them to the rice.
B) didn't cook the rice completely, before he added the vegetables to it.
C) thawed the frozen raw chicken in a covered tray on the bottom shelf of the refrigerator.
D) didn't wash the knife that he used to cut up the chicken before using it to cut up the fruit.