Which three classes of Navy vessels were predominant during the 19th century?

The predominant classes of Navy vessels during the 19th century were ships of the line, frigates, and sloops of war. Ships of the line were large, heavily armed warships that formed the backbone of naval fleets, typically used in battle lines during fleet engagements. Frigates were smaller, more maneuverable vessels that served a variety of roles, including escort and commerce protection, while also being capable of engaging other ships. Sloops of war were smaller than ships of the line and frigates and were often used for patrol duties and escort missions.

Given this context, the other options do not accurately reflect the vessel classes that were central to naval warfare during the 19th century. Battleships, aircraft carriers, and cruisers became prominent in the 20th century. Similarly, destroyers, submarines, and patrol boats were primarily developed in the late 19th and 20th centuries, responding to the needs of modern naval warfare. Lastly, corvettes, gunboats, and container ships do not represent the primary naval combatants of the 19th century, as container ships emerged much later with the rise of commercial shipping needs after World War II.