An inductor of inductance $L$, a capacitor of capacitance $C$ and a resistor of resistance $R$ are connected in series to an ac source of potential difference $V$ volt as shown in figure.Potential difference across $L,C$ and $R$ is $40 \mathrm{V},10 \mathrm{V}$ and $40 \mathrm{V}$, respectively. The amplitude of current flowing through $\text{L-C-R}$ series circuit is $10\sqrt{2} \mathrm{A}$. The impedance of the circuit is :

• A

  $4\sqrt{2}\mathrm{\Omega }$
• B

  $5/\sqrt{2}\mathrm{\Omega }$
• Correct answer
  C

  $5\mathrm{\Omega }$
• D

  $4\mathrm{\Omega }$

Hence, the correct answer is option: 'C'.