Concept:A crescent-shaped sand mound formed by wind deposition in deserts.Explanation:Barchan dunes are crescentic depositional features created by wind action in desert regions.Their horns point downwind, and they consist of deposited sand.Rock pedestal, zeugen, and yardang are erosional desert landforms, not depositional features.Therefore, the correct feature is the barchan dune.Answer:D. Barchan dune