The Atomic Mass of Naturally Occurring Silver, Which Is a Mixture

The atomic mass of naturally occurring silver, which is a mixture of two isotopes, is listed as 107.868 u. This means that ,Hint: Individual atoms have a mass number that is the sum of the protons and neutrons.

A) all silver atoms found in nature have a mass that is 107.868/12.000 times as great as that of a ¹²C atom.
B) all silver atoms found in nature have a mass that is 107.868/1.0079 times as great as that of a ¹H atom.
C) some silver atoms found in nature have a mass that is 107.868/12.000 times as great as that of a ¹²C atom.
D) some silver atoms found in nature have a mass that is 107.868/1.0079 times as great as that of a ¹H atom.
E) no silver atoms found in nature has a mass that is 107.868/12.000 times as great as that of a ¹²C atom.