; and (B) subject to appropriations, and in accordance with subsection (d), may provide for the construction of any of the routes included in the proposal. (2) Priority In completing the analysis required by paragraph (1)(A), in accordance with subsection (d), the Secretary shall give priority to expanding motorized and nonmotorized recreational trail opportunities within the District that are in the public interest. (3) Deadline The Secretary shall complete the analysis required by paragraph (1)(A) by not later than 3 years after the date on which the Secretary receives the applicable collaboratively developed proposal. (c) Use of volunteer services and contributions The Secretary may accept volunteer services and contributions from non-Federal sources to construct and maintain recreational trails under this section. (d) Compliance In carrying out this section, the Secretary shall comply with— (1) each provision of law (including regulations) that is generally applicable to the National Forest System