Which one is borazole or borazine (inorganic benzene)?

• A

  B

• B

  ${\mathrm{B}}_3{\mathrm{N}}_3{\mathrm{H}}_6$

• C

  ${\mathrm{B}}_2{\mathrm{H}}_6$

• D

  ${\mathrm{B}}_6{\mathrm{H}}_6$