; and (III) other activities the Secretary determines to be appropriate to make efficient, long-term project management easier. (B) Credit An early systems work agreement may provide that on execution of a grant agreement under this section, budget authority available under this section may be credited to the applicant to reimburse budget authority obligated under the early systems work agreement if the early systems work agreement does not alter the financing plan the applicant submitted to Secretary for the project to be evaluated under subsection (g) or (h), as applicable. (C) Interest and other financing costs (i) In general Interest and other financing costs of efficiently carrying out the early systems work agreement within a reasonable time shall be considered a cost of carrying out the agreement, except that eligible costs may not be more than the cost of the most favorable financing terms reasonably available for the project at the time of borrowing. (ii) Certification To be eligible to enter into an agreement under this subsection, the applicant shall certify to the Secretary that the applicant has shown reasonable diligence in seeking the most favorable financing terms. (D) Failure to carry out project If an applicant does not carry out the project for reasons within the control of the applicant, the applicant shall repay all Federal grant funds awarded for the project from all Federal funding sources, for all project activities, facilities, and equipment, plus reasonable interest and penalty charges allowable by law or established by the Secretary in the early systems work agreement. (o) Undertaking parts of projects in advance under letters of no prejudice (1) In general The Secretary may pay to an applicant all eligible project costs under the program, including costs for an eligible project incurred prior to the date on which the project receives funding under the program if— (A) before the applicant carries out the applicable portion of the eligible project, the Secretary approves through a letter