An Older Patient with a History of Sodium Retention Arrives

An older patient with a history of sodium retention arrives to at the clinic with the complaints of "heart skipping beats" and leg tremors. What should the nurse ask this patient regarding these symptoms?

A) "Have you stopped taking your digoxin medication?"
B) "When was the last time you had a bowel movement?"
C) "Were you doing any unusual physical activity?"
D) "Are you using a salt substitute?"