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conclusion: zin gel is more effective than zinc lozenges because gel is applied nasally where most of the cold viruses are.
to weaken this we have to show that zince gel's effectiveness is because of some other reason.
option C says that zinc lozenges have other ingredient such as citric acid which interferes with the chemical activity of zinc. And that is why zinc lozenges are less effective and zinc gel is more effective.
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...