Final answer:
Erythropoiesis is the term for red blood cell formation.
Step-by-step explanation:
The term for red blood cell formation is option D, Erythropoiesis. Hemopoiesis is the process by which the formed elements of blood are continually produced, including red blood cells. Erythropoiesis specifically refers to the production of red blood cells in the red bone marrow. Hemopoietic growth factors, such as erythropoietin, promote the proliferation and differentiation of formed elements.