Triple

Target class: river defense fleet
Context triple: [Confederate River Defense Fleet, instanceOf, river defense fleet]

• A. naval fleet chosen
  A naval fleet is a large, organized group of warships and support vessels operating together under a unified command to project maritime power and conduct naval operations.
• B. naval defense system
  A naval defense system is an integrated network of sensors, weapons, platforms, and command-and-control components designed to detect, deter, and neutralize maritime threats to ships, fleets, and coastal assets.
• C. sealing fleet
  A sealing fleet is a coordinated group of vessels engaged in the hunting, harvesting, and processing of seals, typically operating in remote, icy marine regions.
• D. naval unit
  A naval unit is an organized group of maritime military assets—such as ships, submarines, aircraft, and personnel—structured to conduct operations and missions at sea.
• E. naval arsenal
  A naval arsenal is a specialized military facility where warships are built, repaired, equipped, and supplied with weapons, ammunition, and other naval stores.
• F. None of above.