For ${10}^{-2} \left(\mathrm{M}\right) {\mathrm{H}}_3{\mathrm{PO}}_3$ solution which of the following relations is correct ?

• A

  $\left[{\mathrm{H}}_3{\mathrm{PO}}_3^{ }\right] + \left[{\mathrm{H}}_2{\mathrm{PO}}_3^{-}\right] + \left[{\mathrm{HPO}}_3^{2-}\right] + \left[{\mathrm{PO}}_3^{2-}\right] = {10}^{-2}$

• B

  $\left[{\mathrm{H}}_3{\mathrm{PO}}_3^{ }\right] + \left[{\mathrm{H}}_2{\mathrm{PO}}_3^{-}\right] + \left[{\mathrm{HPO}}_3^{2-}\right] = {10}^{-2}$

• C

  $\left[{\mathrm{H}}_2{\mathrm{PO}}_3^{-}\right] + \left[{\mathrm{HPO}}_3^{2-}\right] + \left[{\mathrm{PO}}_3^{3-}\right] = {10}^{-2}$

• D

  $\left[{\mathrm{H}}_3{\mathrm{PO}}_3^{ }\right] + \left[{\mathrm{H}}_2{\mathrm{PO}}_3^{-}\right] + 2\left[{\mathrm{HPO}}_3^{2-}\right] = {10}^{-2}$