If $4n\mathrm{Î\pm }=\mathrm{π}$ then the value of  $\tan ⁡\mathrm{Î\pm } \tan ⁡2\mathrm{Î\pm } \tan ⁡3\mathrm{Î\pm }…\tan ⁡(2n−1)\mathrm{Î\pm }$ is 

• A

  -1

• B

  0

• C

  1

• D

  none of these