A nurse is seeing a client who is having difficulties understanding why it would be dangerous to take more vitamin D than indicated on the directions on the bottle. Which of the following responses by the nurse is best?

a. Vitamin D is fat soluble; excess can enhance blood thinning.
b. Vitamin D is water soluble; excess is absorbed directly into the bloodstream.
c. Vitamin D is water soluble; excess is excreted in the urine.
d. Vitamin D is fat soluble; excess is stored.