An Older Adult with a History of Sodium Retention Arrives

An older adult with a history of sodium retention arrives at the clinic complaining of 'missed heartbeats' and leg tremors. Which of the following should the nurse ask this person regarding these symptoms?

A) 'Are you feeling agitated?'
B) 'When was the last time you had your bowels open?'
C) 'Have you stopped taking your digoxin medication?'
D) 'Are you using a salt substitute?'