Mr.Dubrovnik has enteral feeds infusing into a soft bore feeding tube.The feeding is running at the prescribed rate.On early morning assessment,the nurse observes that Mr.Dubrovnik's breathing is shallow and his colour is dusky.What is the nurse's priority action?

A) Place Mr.Dubrovnik in high Fowler's position
B) Turn off the tube feeding
C) Assess Mr.Dubrovnik's lung sounds
D) Assess Mr.Dubrovnik's bowel sounds

Mr.Dubrovnik's shallow breathing and dusky color suggest that he may be experiencing aspiration, which is a potential complication of enteral feeding. The nurse's priority action is to turn off the tube feeding to prevent further aspiration and to closely monitor Mr.Dubrovnik's status. The other options, such as placing him in high Fowler's position or assessing his lung and bowel sounds, may also be important interventions, but they are not the immediate priority in this situation.