; or (B) is under 21 years of age and is not a guardian of the child passenger. (c) Period of availability of withheld funds; effect of compliance and noncompliance (1) Period of availability of withheld funds Any funds withheld under subsection (a) from apportionment to a State shall remain available for apportionment to the State until the end of the third fiscal year following the fiscal year for which the funds are authorized to be appropriated. (2) Apportionment of withheld funds after compliance If, before the last day of the period for which funds withheld under subsection (a) from apportionment are to remain available for apportionment to a State under paragraph (1), the State meets the requirements of subsection (b), the Secretary shall, on the first day on which the State meets the requirements of subsection (b), apportion to the State the funds withheld under subsection (a) that remain available for apportionment to the State. (3) Period of availability of subsequently apportioned funds Any funds apportioned pursuant to paragraph (2)— (A) shall remain available for expenditure until the end of the third fiscal year following the fiscal year in which the funds are so apportioned