The Nurse Teaches Elderly Citizens at a Senior Citizen Center

The nurse teaches elderly citizens at a senior citizen center about the effectiveness of vitamin C in preventing the common cold.The nurse evaluates that learning has occurred when the elderly citizens make which statement?

A) "Vitamin C,in the form of orange juice,is the most effective aid in preventing the common cold."
B) "There is no proof that vitamin C prevents the common cold."
C) "Vitamin C is only effective in preventing the common cold if 2 grams/day are taken."
D) "Vitamin C must be taken prior to the onset of the cold to be most effective."