The Clausius and Mossotti equation is given by:

Correct option is B

​$$\begin{aligned}&\frac{\varepsilon_r - 1}{\varepsilon_r + 2} = \left( \frac{n \alpha}{3 \varepsilon_0} \right) \\\\\text{Where:} \\&\bullet\ \varepsilon_r = \varepsilon / \varepsilon_0\ \text{is the relative permittivity or} \ \textbf{dielectric constant} \ \text{of the material.} \\&\bullet\ \varepsilon_0\ \text{is the} \ \textbf{permittivity of free space}\text{.} \\&\bullet\ n\ \text{is the} \ \textbf{number density} \ \text{of the molecules (i.e., number of molecules per cubic meter).} \\&\bullet\ \alpha\ \text{is the} \ \textbf{molecular polarizability} \ \text{(a measure of how easily the electron cloud of a molecule can be} \\&\quad\ \text{distorted by an electric field).}\end{aligned}$$​​

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