programs for improving adulthood outcomes for transition-age foster youth: (i) Development grants Development grants to carry out programs with preliminary evidence of effectiveness in improving adulthood outcomes for transition-age foster youth. (ii) Validation grants Validation grants to carry out programs with moderate evidence of effectiveness in improving adulthood outcomes for transition-age foster youth. (iii) Replication grants Replication grants to carry out programs with strong evidence of effectiveness in improving adulthood outcomes for transition-age foster youth. (B) Proportion of different types of grants awarded To the extent feasible and practicable, the Secretary shall award development, validation, and replication grants in equal proportion, but shall award validation and replication grants only to the extent the programs proposed to be carried out with such grants meet the evidence requirements for the applicable type of grant to be awarded. (C) Number of grants The Secretary shall award at least 10, but not more than 15, innovation grants under this subsection. (D) Tribal child welfare agency At least 1 innovation grant shall be reserved for awarding to an eligible entity described in paragraph (2)(B)(iii), unless no such eligible entity meets the application requirements. (4) Duration Each innovation grant awarded under this subsection shall be awarded for a period of not less than 5 years. (5) Amount of grant The amount of an innovation grant awarded under this subsection shall be proportional to the level of funding necessary to implement and evaluate the proposed program at a scale that can be evaluated rigorously, as described in paragraph (5)(F). (6) Application requirements In order to be eligible for an innovation grant under this subsection, an eligible entity shall submit to the Secretary an application containing the following: (A) Program design A description of the proposed program to be carried out using amounts awarded under the grant, including the target population of