Marc eats a well-balanced diet and takes vitamins. Yet, test results show that Marc has a vitamin deficiency. Which of Marc’s body systems are most likely not functioning properly? A. the respiratory and circulatory systems, because the vitamins are being released as waste

B. the digestive and excretory systems, because his body is not absorbing the vitamins in the food he eats

C. the respiratory and digestive systems, because the exchange of oxygen and carbon dioxide is being affected

D. the digestive and nervous systems, because the vitamins are not being transported to the right places in his body