Altough improved efficiency in converting harvested trees

I pick A. the "it" is referring to improved efficiency.. so I don't think there is a problem there.

B looks tempting but the problem is with the "which boosts".

A is good because of llism

Yes u r rite shud be (A).My mistake,demand will be stimulated because of lowering prices is wrong.Also improved efficiency is the reason.

Can anyone enlighten as to how we clearly know that the "it" refers to the improved efficiency ?

I didnt think it was clear, which is why I picked B

A

(A)in converting harvested trees into wood products may reduce harvest rates, it will stimulate demand by increasing supply and lowing prices, thereby boosting
OK, but wasnot sure whether "efficiency in" idiom. "It" refers to efficiency and it is right.

(B)in converting harvested trees into wood may reduce harvest rates, demand will be stimulated beacuse of increasing supply and lowering prices, which boost
out. which could refer to prices or to the stimulated demand. confusing.

(C)of converting harvested trees into wood products may reduce harvest rates, it will stimulate demand by increasing supply and lowering prices, which boosts
out. boosts not // with future tense

(D)of harvested trees being converted into wood products may reduce harvest rates, it will stimulate demand, because it will increase supply and lower prices, thereby boosting
out

(E)when harvested trees are converted into wood products may reduce harvest rates, demand will be stimulated because of increasing supply and lowering prices, which boost
out

only "efficiency" is singular...that is why "it" refers to efficiency..

efficiency in~ is idiomatic.

Between A and B, only the former is ll

"which" in B refers to what?

A is my answer, inspite of typo "lowing"

I picked A.

I have a question about the usage lowing price

is that right way of saying or should be lowering price .


ALL Verbal gurus, please help me to understand.