What is China doing to prevent the desertification of its land?

A Digging canals
B Building dams
C Planting Trees
D Dredging rivers

Choose one of the 4

Honestly It could be Planting trees, Dredging rivers, and Building dams.

Explanation:

Not sure if its a select all that apply but any of them would work except digging canals.

i do believe that its called,(the segovia highlands); plz check first good luck;