In ruling on a petition for a child’s adoption under this Part III of this subtitle, a juvenile court shall consider: any assurance by a local department to fund needed support for the child; all factors necessary to determine the child’s best interests; and a report by a child placement agency, completed in accordance with Department regulations, as to: the suitability of the petitioner to be the child’s parent; and the child’s successful placement with the petitioner under the supervision of the local department or its agent for at least 180 days or a shorter period allowed by the juvenile court on recommendation of the local department. In ruling on an adoption petition under this Part III of this subtitle, a juvenile court may not deny the petition solely because the petitioner is single or unmarried. If a parent consents to adoption in accordance with § 5-338 of this subtitle, loss of parental rights shall be considered voluntary.