Final answer:
Fat-soluble vitamins are absorbed mostly in the small intestine and can lead to hypervitaminosis if consumed in excessive amounts.
Step-by-step explanation:
The correct answer to the question 'Which of the following is true of fat-soluble vitamins?' is option b. They are absorbed mostly in the small intestine. Fat-soluble vitamins, which include vitamins A, D, E, and K, are absorbed with dietary lipids in micelles by simple diffusion in the small intestine. Unlike water-soluble vitamins, fat-soluble vitamins can accumulate in the body's lipid stores, leading to a risk of hypervitaminosis if consumed in excessive amounts.