There Are Two Stable Isotopes of Chlorine: Chlorine-35, with a Mass

Multiple Choice

There are two stable isotopes of chlorine: chlorine-35, with a mass of 34.968853 amu; and chlorine-37, with a mass of 36.965903. Given that the average atomic mass of a chlorine atom is 35.45 amu, which of the following statements is true?

A) Chlorine contains almost exclusively $~{}_{17}^{35}\text{Cl}$ with very little $~{}_{17}^{35}\text{Cl}$
B) Chlorine contains more $~{}_{17}^{35}\text{Cl}$ than $~{}_{17}^{35}\text{Cl}$ .
C) Chlorine contains roughly equal amounts of $~{}_{17}^{35}\text{Cl}$ and $~{}_{17}^{35}\text{Cl}$
D) Chlorine contains more $~{}_{17}^{35}\text{Cl}$ than $~{}_{17}^{35}\text{Cl}$
E) Chlorine contains almost exclusively of $~{}_{17}^{35}\text{Cl}$ , with very little $~{}_{17}^{35}\text{Cl}$ .