Given below are the statements about diborane
(a) Diborane is prepared by the oxidation of ${\mathrm{NaBH}}_4$ with ${\mathrm{I}}_2$
(b) Each boron atom is in ${\mathrm{sp}}^2$ hybridized state
(c) Diborane has one bridged $3$ centre-$2$-electron bond
(d) Diborane is a planar molecule

The option with correct statement(s) is 

• A

  (c) and (d) only
• Correct answer
  B

  (a) only
• C

  (c) only
• D

  (a) and (b) only

Hence, the correct answer is option: 'B'.