Multiple choice Vitamin B12 is helpful in the absorption of fats to stimulate the liver to stimulate the bone marrow to increase life span of RBC Reveal answer Fill a bubble to check yourself C Correct answer Explanation Vitamin B12 (cobalamin) is essential for DNA synthesis and red blood cell formation in bone marrow. Deficiency causes megaloblastic anemia due to impaired erythropoiesis, not effects on fat absorption, liver stimulation, or RBC lifespan.