At the hearing, all interested persons shall be given the opportunity to present evidence and testimony for or against the proposed annexation. Any person who shall have filed a written protest may withdraw the written protest at any time prior to the conclusion of the hearing.
If a majority protest shall not have been filed, the district board, not later than 30 days after the conclusion of the hearing, shall adopt a resolution making one of the following determinations:
(a) Disapproving the proposed annexation.
(b) Approving the proposed annexation.
(c) Approving the annexation, but excluding any lands which the board finds will not be benefitted by becoming a part of such improvement district.