Which appeal is demonstrated by the warning of a long strike if the labor contract is rejected?

The warning of a long strike if the labor contract is rejected exemplifies the Appeal to Practical Consequences. This type of appeal focuses on the tangible, real-world outcomes that can result from a decision or action. By threatening a lengthy strike, the message communicates the direct and negative consequences that would affect both parties—specifically, the loss of wages for workers and potential disruptions for employers.

This appeal is effective because it prompts the audience to consider the practicality of their decisions, nudging them towards accepting the labor contract in order to avoid the adverse outcomes of a strike. It emphasizes the importance of weighing potential consequences when making decisions, which can lead to more cooperative behavior. In contrast, the other choices involve different types of emotional or stylistic appeals that do not address the practical implications of a strike.