The Nurse Has Completed Teaching a Patient About MDI Use

The nurse has completed teaching a patient about MDI use. Which patient statement indicates that further patient teaching is needed?

A) "I will shake the MDI each time before giving the medication."
B) "I will take a slow, deep breath in after pushing down on the MDI."
C) "I will float the canister in water to decide whether I need to get a new MDI."
D) "I will attach a spacer to the MDI to make it easier for me to use."