An "appeal" is a formal request to a higher court or authority for a review and possible reversal of a decision made by a lower court or tribunal. In the context of the sentence, the governor is dissatisfied with the ruling of the tribunal and is taking legal action by filing an appeal. An appeal is a common legal term used when someone challenges a decision and seeks a reconsideration from a higher judicial body. The other options, such as "injunction," "objection," and "application," do not specifically convey the idea of seeking a review of a tribunal ruling.