Which of the following is a way that humans speed up the process of erosion?
a. urban development
b. hiking
c. deforestation
d. all of the above

(D) All of the above

Explanation:

  All the given options are the way that are caused by the humans and it speed up the erosion process. Erosion is the natural and the geological process where the wind, water and the ice transport sand, rocks and the soil away.

The erosion process mainly occur on the surface of the earth and it has no major effect on the core and the mantle of the earth. The deforestation and the development of the urbanization increases the process of erosion.

Therefore, Option (D) is correct.

the answer would be b).