Which amphibious vehicle is specifically designed for high-speed transport over the beach?

The correct choice is the LCAC, or Landing Craft Air Cushion. It is specifically designed for high-speed transport over the beach and can travel across various terrain types, including water and land. The LCAC operates on a cushion of air created by large fans, allowing it to achieve higher speeds compared to more traditional amphibious vehicles. This capability is critical for rapid deployment during amphibious operations, enabling it to quickly move troops, equipment, and supplies from ship to shore.

Its design includes features that allow it to navigate over obstacles and shallow water, further enhancing its versatility and operational effectiveness. The vehicle supports efficient beach landings and is particularly useful in situations where time-sensitive operations are necessary, making it a vital asset in modern amphibious warfare.