Concept:Wind erosion wears away rock surfaces to form certain desert landforms, while other landforms are created by wind deposition.
Explanation:Zeugen are table-like rock masses formed when wind abrasion removes softer rock layers beneath a harder cap rock. They are erosional features.
Yardangs are elongated, streamlined ridges carved by wind in the direction of the prevailing wind. They are also produced by wind erosion.
Ventifacts are rocks that have been shaped, faceted, and polished by the sandblasting action of wind-borne particles. They clearly result from wind erosion as well.
Barchans, however, are crescent-shaped sand dunes that form when the wind deposits sand rather than eroding the surface. Because barchans are depositional landforms, they are not formed by wind erosion.
Therefore, the landform that is the exception among the options is barchan.
Answer:D. barchan