Factor affection thinning is/are:

A.Site quality (S.Q) : For good SQ thinning will be heavy but for poor S.Q. It will be of lighter intensity
B.For hot, dry, weedy site, southern aspect thinning will be of lighter intensity.
C.Objective: For getting timber, heavily thinnings carried out and for getting fuel wood, no need or light, thinning is done
D.All of the above

Thinning problems are:

A.Good and bad trees mix that their spacing in uneven, so either good trees or trees at equal spacing are maintained
B.To search out negative characteristic tree (negative approach)
C.Both (a) & (b)
D.None of these