The relative stability of +1 oxidation state of group 13 elements follows the order.

• A

  $\mathrm{AI}<\mathrm{Ga}<\mathrm{TI}<\mathrm{In}$

• B

  $\mathrm{AI}<\mathrm{Ga}<\mathrm{In}<\mathrm{TI}$

• C

  $\mathrm{TI}<\mathrm{In}<\mathrm{Ga}<\mathrm{AI}$

• D

  $\mathrm{Ga}<\mathrm{AI}<\mathrm{In}<\mathrm{TI}$