Power factor is maximum in an LCR circuit when

• A

  ${\mathrm{X}}_{\mathrm{L}}={\mathrm{X}}_{\mathrm{C}}$

• B

  R = 0

• C

  ${\mathrm{X}}_{\mathrm{L}}=0$

• D

  ${\mathrm{X}}_{\mathrm{C}}=0$