Based on the advantages listed in the chart—familiarity with the land, access to resources, and a willingness to fight—the major advantage the colonists had over the British during the Revolutionary War was their familiarity with the land and their access to resources.
While European financial support was a factor later in the war, it wasn't considered a direct advantage at the onset. The colonists did not have more soldiers than the British for a significant portion of the war, and in terms of supplies, the British had a more robust supply chain initially. Therefore, the correct answer regarding the major advantage would be that the colonists had familiarity with the land and access to resources.