Final answer:
The primary advantage of a closed system for tube feedings is the decreased risk of bacterial contamination, ensuring the sterility and safety of the nutritional formula for the patient.
Step-by-step explanation:
The primary benefit of a closed system for tube feedings is a. decreased risk of bacterial contamination. This is because a closed system is sealed and thus prevents external contaminants, including bacteria, from entering the system. This advantage helps ensure that the tube feeding remains sterile, reducing the risk of infection to the patient. Furthermore, closed systems can also be more efficient in delivering nutrients as they minimize contact with air, potentially preventing the degradation or separation of formula.