For Erythropoiesis to Proceed Normally, the Progenitor Cells Must Receive

Multiple Choice

For erythropoiesis to proceed normally, the progenitor cells must receive adequate supplies of which of the following?
(1) amino acids
(2) calcium
(3) iron
(4) vitamin B₁₂
(5) vitamin K
(6) vitamin A

A) 1, 2, 3, 4, 5, 6
B) 2, 4, 6
C) 1, 3, 5
D) 1, 3, 4
E) 2, 3, 5, 6