We have three devices, a capacitor of $\mathrm{C}=1\mathrm{\mu F}$ , an inductor of L = 10mH and a resistor of ‘R’ $\mathrm{\Omega }$ when C and R are used in series combination and an alternating source of emf is connected across it, current leads the supply voltage by ${45}^0$ when L and R are used in series combination and the same supply voltage is applied across the combination, current lags the supply voltage by  ${45}^0$. Then R is

• A

  $10\mathrm{\Omega }$

• B

  $100\mathrm{\Omega }$

• C

  $10\sqrt{10}\mathrm{\Omega }$

• D

  $100\sqrt{10}\mathrm{\Omega }$