(A) A husband and wife together, at least one of whom is an adult; (B) An unmarried adult; (C) The unmarried minor parent of the person to be adopted; (D) A married adult without the other spouse joining as a petitioner if any of the following apply:
(1) The other spouse is a parent of the person to be adopted and supports the adoption; (2) The petitioner and the other spouse are separated under section 3103.06 or 3105.17 of the Revised Code; (3) The failure of the other spouse to join in the petition or to support the adoption is found by the court to be by reason of prolonged unexplained absence, unavailability, incapacity, or circumstances that make it impossible or unreasonably difficult to obtain either the support or refusal of the other spouse.
