Answer:
Option B, secondary
Explanation:
Secondary landforms are formed out of primary landform through some modification such as erosion, weathering , mass movement etc. Also all physical, chemical and biological forces acts to transform a primary landform into a secondary landforms.
A canyon is formed as result of continuous erosion of mountain, plateau and hill by water and wind over a long period of time
Thus, canyon are secondary structure.
Option B is correct
