Which is the best way to determine if an object is made of pure silver?

A determine the solubility of the object
B test to see if the object is chemically reactive
C determine the density of the object and compare the known density of pure silver
D compare the mass of the silver object to the mass of a piece of pure silver




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My answer is letter b. 
this is the best because solubilty,mass and density of the object can be cheat or use it create it as a new making a fake one.

>Hope it helps
don't copy my answer,it is based on my mind !!
From: TaengPark