honchos wrote:
This is a GMAT prep question and the Official answer here is A.
Can someone throw light here why efficiency in is better than efficiency of.
There's not that much difference in the words but what follows them
Efficiency of is used in ' efficiency of harvested trees'... implying that harvested trees were doing something and have become more efficient
![FLO – Therapy at the Club – Pre-Single [iTunes Plus M4A]](http://is1-ssl.mzstatic.com/image/thumb/Music221/v4/a4/11/88/a41188ed-0f2e-e8d5-1163-d59e373cc58c/26UMGIM30046.rgb.jpg/208x208bb.webp)
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