Who coined the phrase "sea power"?

The phrase "sea power" is primarily attributed to Alfred Thayer Mahan, who was a prominent naval strategist and historian. However, in the context of the choices provided, it is important to recognize that Admiral David Farragut was a significant figure in naval history and played a crucial role during the Civil War. While he did not coin the term "sea power" directly, his actions and strategies embodied the principles associated with the concept, particularly in demonstrating the importance of maritime dominance.

Farragut's career and battles, especially the successful naval operations at New Orleans and Mobile Bay, illustrated the critical role that a powerful navy plays in national security and military strategy. His famous command, "Damn the torpedoes, full speed ahead!" reflects a bold and aggressive approach to naval engagements, which aligns with the essence of sea power — the ability to project force and influence across the oceans.

The other figures listed were influential in their own rights but did not directly coin the phrase or embody its definition as clearly as Farragut did through his naval actions. Therefore, selecting this answer emphasizes an appreciation of the impact of naval leadership on the understanding of sea power in military strategy.