Final answer:
A child diagnosed with acquired aplastic anemia has the best prognosis with a bone marrow transplant.
Step-by-step explanation:
The child diagnosed with acquired aplastic anemia will have the best prognosis with a bone marrow transplant. A bone marrow transplant involves giving a small amount of bone marrow from a healthy donor intravenously to the recipient. The donated bone marrow will find its way to the bone and reconstitute the patient's immune system, which is usually destroyed beforehand by treatment with radiation or chemotherapeutic drugs. This procedure has shown to be effective in treating aplastic anemia and improving the prognosis for the child.