Which of the following statements accurately describes the difference between nutrient density (ND) and energy density (ED)?

a .ED refers to foods that are low in nutrients and high in energy; ND refers to foods high in nutrients and energy.
b. ED refers to foods that are high in nutrients (such as vitamins and minerals) but low in kilocalories.
c. ND refers to foods high in weight/volume; ED refers to foods high in nutrients (such as vitamins and minerals) and high in kilocalories
d. ND refers to foods that are rich in nutrients (such as vitamins and minerals) and low in kilocalories; ED refers to foods high in energy and low in volume/weight