What type of ship is responsible for transferring large quantities of fuel and ammunition?

The correct answer identifies fleet replenishment oilers as the type of ship specifically designed for transferring large quantities of fuel to naval vessels at sea. These ships play a critical role in sustaining naval operations by allowing surface ships and submarines to refuel while still on mission, thus extending their operational range and decreasing the need to return to port for refueling.

Fleet replenishment oilers have specialized equipment and capabilities, such as pumps and hoses, to ensure that fuel is transferred safely and efficiently. This ability to replenish fuel on the move keeps military forces agile and effective during extended operations.

While fast combat support ships also play a role in supplying fleets by delivering ammunition, food, and fuel, their primary function leans more towards rapid logistical support rather than exclusively transferring large quantities of fuel. Carrier vessels focus on supporting air operations through the deployment of aircraft, and landing ship tanks are typically used for transporting troops and equipment to shore, not specifically for fueling or ammunition transfers. This makes fleet replenishment oilers the best fit for the specified task of transferring fuel and ammunition.