Final answer:
Option b is the correct answer. The PRO article appeals to morality by arguing for the need and ability of Americans to support a third party for a better and distinct political future, emphasizing voters' power to influence change.
Step-by-step explanation:
The author of the PRO article appeals to the reader's sense of morality by (B) arguing that Americans can make the decision to do better and support a third party. This argument is based on the idea that political parties should offer clear and distinct visions for the future to enable better government and accountability. The current two-party system in the United States tends to present moderate policy alternatives and thus hampers substantial reform or the emergence of distinct political identities. Moreover, the presence of historical realignment and critical elections showcase the potential for third parties to influence change and the importance of voter choice in shaping political landscapes.