A client asks the nurse how much vitamin C should be taken to prevent a cold. Which information should the nurse discuss with the​ client?
A.
​"Vitamin C must be taken prior to the onset of the cold to be most​ effective."
B.
​"Increase your dietary intake of Vitamin C as well as add an oral​ supplement."
C.
​"Vitamin C is effective if you take the recommended daily​ allowance."
D.
​"There is no proof that vitamin C prevents the common​ cold."