Concept:A blood transfusion is the medical process of putting donated blood into a patient’s bloodstream.Explanation:The sentence requires a word that names the medical procedure of giving blood to a sick child.Option D, “transfusion,” is the correct medical term for this procedure.The other options do not fit: “transformation” means a change in form, “transfer” means moving something generally, and “transmission” means passing something from one person to another.Answer:D. transfusion