C. The lowering of land surface caused by wind
Deflation is wind activity which also causes rock erosion or transports sand and dirt.
Deflation is also known as aeolian processes and aeolus was a Greek god of wind. So it's wind related. Maybe this will help you memorize it. At least thats how i memorized it.
The best answer to describe deflation in Earth science is C. The lowering of land surface caused by wind. Deflation involves the erosion of surface materials due to wind action, resulting in changes to the landscape.
;