What was the outcome of the Battle of Thermopylae?

The outcome of the Battle of Thermopylae in 480 BCE is characterized by the fact that the Greek forces, despite being vastly outnumbered, were able to hold off the Persian army for a significant period of time. This battle is particularly noted for the valor and determination of the soldier-king Leonidas and his contingent of Spartans, who, along with other Greek allies, made a stand against a much larger Persian force.

The Greeks' ability to strategically choose the narrow pass at Thermopylae allowed them to leverage their military training and equipment, effectively utilizing the terrain to their advantage. Although ultimately the Persians did breach their defenses, the time gained was crucial for the Greek city-states to prepare for future confrontations. The battle became a symbol of courage and sacrifice and was instrumental in rallying the Greek forces, culminating in future victories against the Persians, such as at the Battle of Salamis.

Thus, the assertion that the Greek forces held off the Persians for a time captures the essence of the battle's significance and is the correct choice. The other options do not accurately reflect the complexity of the battle's outcome and the strategic implications it had for the subsequent resistance against Persian invasion.