Erythropoietin stimulates RBC production, but a glycosylated form (DARBEPOIETIN) has a longer duration of action (it is given 2x/month vs. 2-3X/week) than erythropoietin.  Filgrastim and sagramostim are used to promote myeloid cell productionInterleukin 11 and romiplostim are used to increase platelet production.

The correct answer is A.