Final answer:
Option A, 'Leadership during the Revolutionary War,' is the best summary subject for the excerpt about George Washington, as it addresses his crucial role in American history during the military conflict that led to the founding of the nation.
Step-by-step explanation:
Given the available excerpts, option A, Leadership during the Revolutionary War, provides the best subject in summary for the excerpt about George Washington. It covers his role as Commander of the Continental Army and his leadership throughout the American Revolution, which solidified his legacy as a key figure in American history. This choice encapsulates Washington's military leadership and how it contributed to the founding of the nation.
While other aspects of Washington's life and presidency, such as his foreign policy challenges, are mentioned, these do not reflect the primary focus of the provided excerpts. The Revolutionary War era, culminating in his military command and consequential actions, stands out as the most significant subject when summarizing George Washington's impact.