Phenylketonuria, or PKU, is a recessive genetic disorder in which the amino acid phenylalanine cannot be properly metabolized. Children with PKU develop mental disabilities. However, the condition can be prevented with a special diet if the disease is caught very early. Which of these is a societal decision that could be made based on scientific knowledge about PKU? A.Some parents choose to serve meals that meet a PKU diet even if no one in the family has PKU. B. Hospitals are required to screen all newborn babies for PKU. C. Newborn babies who are heterozygous for PKU should be treated for the disorder. D.Both parents must carry the gene to pass on the PKU disorder.