Why should only professional foresters set prescribed fires?

since they know more about how they work and they are more experienced that other who may not be as experienced as them

Explanation:

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

if you know your abc's you should be able to get your answer or just use google