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The OA is C. Why? because in the original sentence, the word "estimate" and "approximately" are redundant. Also, although using either "that study" or "who study" could be appropriate, using the present participle "studying" is generally considered more concise.
Last edited by tarek99 on 29 Nov 2007, 10:17, edited 1 time in total.
Check out this awesome article about Anderson on Poets Quants, http://poetsandquants.com/2015/01/02/uclas-anderson-school-morphs-into-a-friendly-tech-hub/ . Anderson is a great place! Sorry for the lack of updates recently. I...