Final answer:
A jar of ketchup is a potentially hazardous TCS food because it does not typically require time and temperature control.
Step-by-step explanation:
A potentially hazardous TCS (Time/Temperature Control for Safety) food is D. A jar of ketchup.
According to the reference information provided, TCS foods are foods that require time and temperature control to prevent the growth of harmful bacteria. TCS foods can become hazardous if they are not stored, cooked, or handled properly. While options A, B, and C may be considered TCS foods, ketchup (option D) does not typically require time and temperature control, making it the least likely to be potentially hazardous.
It is important to note that the safety of food depends on various factors such as storage conditions, preparation methods, and the presence of any contaminants. It is always recommended to follow safe food handling practices to minimize the risk of foodborne illnesses.