A Nurse Teaches a Client That the Functions of Vitamins

A nurse teaches a client that the functions of vitamins are specific. Which statement by the client indicates that further teaching is necessary?

A) "Vitamin C prevents scurvy, which affects bones. Vitamin D does too, so it's okay to take vitamin D if my vitamin C intake is too low."
B) "The B vitamins, along with vitamin C and biotin, are all water-soluble vitamins that I can take and dissolve in water."
C) "I could die if I take too much vitamin A or vitamin D, because those are fat-soluble vitamins that have varying lengths of absorption in the gut."
D) "Even though vitamins E and K are fat-soluble, they have different functions, and I cannot substitute one for another."