The inductive reactance of an inductor of  $\frac{1}{\mathrm{\pi }}$ henry at 50 Hz frequency is 

• A

  $\frac{50}{\mathrm{\pi }} \mathrm{ohm}$

• B

  $\frac{\mathrm{\pi }}{50} \mathrm{ohm}$

• C

  100 ohm

• D

  50 ohm