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monk16
Wood harvesting causes two issue

1) exposure

2) same kind of trees and therefore susceptible to diseases

fix can be like

1) trees that are planted again can be of different species

2) trees can be selectively cut down

B gives option 2

But if you see, option A touches the same too.

it says gap between two harvesting and then selective cutting of mature trees only. by this you can also save the soil erosion.
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Gnpth
The use of a wood harvesting technique known as clear cutting has had two especially insidious environmental impacts. The first is that it causes erosion, as hillsides that were covered with mature trees are abruptly exposed to the full impact of the elements. The second is that when new trees grow in the area they are often nearly all of the same age and species and therefore highly susceptible to disease and insect infestation.

From the passage above, it can be properly inferred that wood harvesting can continue with fewer negative impacts if which of the following techniques is employed?

(A) Waiting longer periods between harvests so that the trees will be larger when cut.

(B) Using selective harvesting techniques that leave some mature trees standing.

(C) Spraying areas that are clear cut with an insecticide to prevent infestation.

(D) Leaving some areas uncut, such as those near state parks and along roadsides.

(E) Planting monocultures, a single species of fast growing tree, in areas that have been clear cut.

to prevent erosion and infestation of all the trees - we need to not cut all the trees -> so need to leave some old trees in the place. only B addresses this issue.
A - still not helping to solve the issue
B - looks good
C - erosion is still present
D - iswat..
E - infestation is still a problem.
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