When a referendum petition is filed with the City Secretary, the ordinance sought to be reconsidered shall be suspended from taking effect. Such suspension shall terminate when:
(a) there is a final determination of insufficiency of the petition, or
(b) the petitioners' committee withdraws the petition, or
(c) the Council repeals the ordinance, or
(d) thirty (30) days have elapsed after a vote for repeal of the ordinance has failed.