with paragraph (3). Such States or Indian tribes shall be selected for a grant under this paragraph based on criteria established by the Secretary. (B) Grant funds (i) In general The funds awarded through a grant under subparagraph (A) for a fiscal year shall remain available for the State or Indian tribe to make subgrants under subsection (c) for such fiscal year and may not be carried over for such following fiscal year. (ii) Return of funds Any funds awarded through a grant under subparagraph (A) that are not expended during the fiscal year of the grant shall be returned to the Secretary to carry out this section. Any funds returned to the Secretary after fiscal year 2023 shall be returned to the general fund of the Treasury. (3) Applications (A) In general Each State desiring a grant under paragraph (1) and each State or Indian tribe desiring a grant under paragraph (2) shall submit an application to the Secretary at such time and in such manner as the Secretary may reasonably require for such grant. (B) Contents (i) In general An application submitted under subparagraph (A) shall contain such information as the Secretary may reasonably require, including a proposal for awarding subgrants under subsection (c) and a method for evaluating such subgrants. (ii) 5-year grants An application submitted under subparagraph (A) for a grant awarded under subsection (b)(1) shall include an assurance that not less than 50 percent of the funds awarded through the grant will be used towards making subgrants under subsection (c) to the entities applying for such subgrants that serve the areas in the State with the highest prevalence of substance use disorder, based on data determined appropriate by the Secretary. (c) Subgrants (1) In general Each State that receives a grant under subsection (b)(1) and each State or Indian tribe that receives a grant under subsection (b)(2) shall award subgrants on a competitive basis to entities that meet the requirements under paragraphs (2) and (3). (2) Subgrant requirements (A)