Unlike the lungs and the kidneys, the liver is an organ well suited for living-donor transplants to children because the portion of the liver which must be removed from a healthy adult to replace the diseased liver of a child will be regenerated in the healthy adult within a few months. Which of the following, if true, provides the most additional support for the conclusion drawn above? ['There is less danger that a transplanted organ will be rejected when the organ donor is a, close relative of the recipient.', 'In removing the portion of liver for transplant there is danger of causing damage to the spleen of the donor, and that could necessitate the removal of the spleen.', 'Each lobe of the liver functions separately, and it is possible to extract a portion of one lobe without disrupting critical liver functions.', 'There are so few suitable donors that about one-half of the babies with liver disease born in the United States each year die before they can receive a liver transplant.']