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A is not best because it is verbose but it has a wrong verb. Thie ratio ..... is and not the ratio ......are. Also in B it should be the ratio of salary of managers to the salary of workers. It incorrectly defines ratio as the salary of managers to ordinary workers. This is wrong.
Also I think the part is not underlined correctly.
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...