How the reaction below can be made to proceed in forward direction

$\mathrm{B}{\left(\mathrm{OH}\right)}_3 + \mathrm{NaOH} \to \left[\mathrm{NaB}{\left(\mathrm{OH}\right)}_4\right] \mathrm{or} \left[{\mathrm{NaBO}}_2 + {\mathrm{H}}_2\mathrm{O}\right]$

• A

  addition of borax

• B

  addition of cis-1, 2-diol

• C

  addition of trans-1, 2-diol

• D

  addition of ${\mathrm{Na}}_2{\mathrm{HPO}}_4$