The process of desertification can occur when?

Question

1)plants usually found in the desert replace trees that have been cut down
2) farmers use contour farming techniques
3)an area of forest is clear-cut
4)an area of forest is selectively cut

I think 3

Answer 1

C i think

Answer 2

Yes it is C.

Answer 3

de·sert·i·fi·ca·tion
n
The transformation of arable or habitable land to desert, as by a change in climate or destructive land use.
http://www.ahdictionary.com/word/search.html?q=desertification

Clear-cutting is obviously an example of "destructive land use"

Yes, 3.