Which of the following best describes the main advantage of amphibious warfare?

The main advantage of amphibious warfare is the ability to strike from both land and sea. This capability allows military forces to conduct operations that are versatile and can exploit weaknesses in enemy defenses that are not easily accessible by either land or sea forces alone. Amphibious operations enable a tactical flexibility, allowing forces to launch surprise attacks, bypass fortified positions, and establish a foothold in enemy territory quickly. Combining sea and land operations maximizes the use of available resources and can significantly enhance operational effectiveness in both assault and support roles, creating opportunities that could be less achievable through traditional warfare strategies.

In comparison, relying entirely on ground forces may limit operational reach and strategic options, while isolating enemy forces through blockades focuses primarily on cutting off supply lines rather than direct attacks. The use of technology to automate troop movement does enhance logistics but does not directly embody the strategic essence of amphibious warfare itself, which is inherently about the combined use of marine and terrestrial forces to achieve military objectives.