Option 1: Delta - A delta is a landform created by the deposition of sediment carried by a river as it enters a body of water, typically a lake or ocean. It is formed when the river`s velocity decreases and it cannot carry its load of sediment, causing the sediment to be deposited and form a fan-like shape.

Option 2: Levee - This is the correct answer. A levee is a broad, low embankment that is built up along the banks of a river channel to prevent flooding. It is typically constructed using materials such as soil, sand, or concrete. Levees help to contain floodwaters and protect nearby land from being inundated during times of high water levels.

Option 3: Flood Plain - A floodplain is the flat, low-lying area adjacent to a river channel that is periodically flooded during high water events. It is often composed of fertile soil that is deposited by the river during floods. Floodplains are important for agriculture and provide natural storage for floodwaters.

Option 4: Dune - A dune is a hill or ridge of sand that is formed by wind or water action. Dunes are typically found in deserts or along coastal areas and are not directly related to river flooding.