The Elderly Patient Reports to the Nurse That He Coughs

The elderly patient reports to the nurse that he coughs a lot during and after meals. What would be most important for the nurse to ask this patient first?

A) "How much do you drink during the day?'
B) "Does the cough keep you awake at night?"
C) "Do you have difficulty swallowing?"
D) "Does it hurt when you cough?"