Concept:Wind transports fine particles and later deposits them when its speed decreases.
Explanation:Very fine sand and silt can be carried by the wind over long distances.
When the wind slows down, these tiny particles settle to the ground in a thick, loose layer.
This wind-deposited layer of fine material is called loess.
Loess is different from sand dunes such as seif and barchan.
Bajada is not formed by wind deposition but by water at the base of mountains.
Therefore, the correct answer is the option that names this fine wind-deposited material.
Answer:A. loess