Turkey's economy has grown prodigiously over the past ten years, averaging an annual increase each year that is about eight percent —one of the highest growth rates in the world.

(A) averaging an annual increase each year that is about eight percent
(B) with an annual average each year which is about eight percent
(C) eight percent is what it averages out to each year
(D) with an average annual increase of about eight percent
(E) the average of the annual increase each year is about eight percent

comma + with (adverbial modifier) = LINK 1 & LINK 2 & LINK 3 & LINK 4 & LINK5 & LINK 6
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Cheers, Rahul.

A is wrong because "averaging" modifies Turkey's economy. It changes the meaning and should be left out. B is wrong because it is stated the "year which is about eight percent". C and E are wrong because there is no connection between the first and the second clause. They need a connection to give some meaning to the whole sentence. Therefore D must be. The underlined part in D, which is phrase, modifies the main clause of the sentence.

D

all other choices are wordy ( "average an annual increase" )

Good explanation nakib! OA is D!
I didnt even see the redundancy of annual and each year!! Good one!
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Cheers, Rahul.