The nurse is talking with a 74-year-old client with previously well-controlled hypertension. The client currently has a blood pressure of 190/88 mm Hg and has had a cold with nasal congestion for the past 3 days. Which of the following questions would be most important for the nurse to ask?

D Are you taking over-the-counter vitamin C supplements? A Have you received the influenza vaccine recently? B Are you taking over-the-counter cold medications? C Have you spent time with your grandchildren recently?