Power dissipated in an $LCR$ series circuit connected to an $A.C.$ source of $e.m.f.$ $\varepsilon$ is

• A
  $\frac{\varepsilon^2 \sqrt{R^2 + (\omega L - \frac{1}{\omega C})^2}}{R}$
• B
  $\frac{\varepsilon^2 R^2 + (\omega L - \frac{1}{\omega C})^2}{R}$
• C
  $\frac{\varepsilon^2 R}{\sqrt{R^2 + (\omega L - \frac{1}{\omega C})^2}}$
• D
  $\frac{\varepsilon^2 R}{R^2 + (\omega L - \frac{1}{\omega C})^2}$