Which coastal feature is formed by wind-driven deposition of sand?

The coastal feature formed by wind-driven deposition of sand is a dune. Dunes are typically found in coastal areas where loose sand is abundant. The process of wind blowing across the sand causes grains to accumulate and form mounds or ridges, which characterizes a dune. This feature not only serves a protective role for inland areas against coastal erosion but also contributes to the unique ecosystem of coastal regions.

In contrast, other mentioned options are formed through different processes. A spit is related to the deposition of sediment by longshore drift, which creates a landform that extends into water but is not primarily driven by wind. A cliff is formed from erosion caused by wave action and geological processes. A lagoon is a shallow body of water separated from a larger body by a barrier such as a sandbar or coral reef, and its formation does not involve the deposition of sand by wind. Thus, dunes stand out specifically for their sand deposition due to wind.