72. In the blood of an adult human, there are approximately 2.64 ✖ 1013 red blood cells with a total of 2.90 g of iron. On theaverage, how many iron atoms in each red blood cell? (Fe = 55.85 g/mol)
(A) 5.19 ✖  10–2
(B) 4.72 ✖ 1011
(C) 1.09 ✖  10–13
(D) 9.10 ✖  1012
(E) 1.18 ✖  109